AVFoundationSimplePlayer: Version 2.0, 2016-09-13

Updated to Swift 3

Demonstrates how to create a simple movie playback app using only the AVPlayer and AVPlayerLayer classes from AVFoundation (not AVKit). You'll see how to open a movie file and then how to implement various functionality including play, pause, fast forward, rewind, volume adjustment, time slider updating, and scrubbing.

AVFoundationSimplePlayer/LICENSE.txt

@@ -0,0 +1,42 @@
+Sample code project: AVFoundationSimplePlayer-iOS: Using AVFoundation to Play Media
+Version: 2.0
+
+IMPORTANT:  This Apple software is supplied to you by Apple
+Inc. ("Apple") in consideration of your agreement to the following
+terms, and your use, installation, modification or redistribution of
+this Apple software constitutes acceptance of these terms.  If you do
+not agree with these terms, please do not use, install, modify or
+redistribute this Apple software.
+
+In consideration of your agreement to abide by the following terms, and
+subject to these terms, Apple grants you a personal, non-exclusive
+license, under Apple's copyrights in this original Apple software (the
+"Apple Software"), to use, reproduce, modify and redistribute the Apple
+Software, with or without modifications, in source and/or binary forms;
+provided that if you redistribute the Apple Software in its entirety and
+without modifications, you must retain this notice and the following
+text and disclaimers in all such redistributions of the Apple Software.
+Neither the name, trademarks, service marks or logos of Apple Inc. may
+be used to endorse or promote products derived from the Apple Software
+without specific prior written permission from Apple.  Except as
+expressly stated in this notice, no other rights or licenses, express or
+implied, are granted by Apple herein, including but not limited to any
+patent rights that may be infringed by your derivative works or by other
+works in which the Apple Software may be incorporated.
+
+The Apple Software is provided by Apple on an "AS IS" basis.  APPLE
+MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
+THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
+FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
+OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
+
+IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
+OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
+MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
+AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
+STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+
+Copyright (C) 2016 Apple Inc. All Rights Reserved.

AVFoundationSimplePlayer/Objective-C/AVFoundationSimplePlayer-iOS.xcodeproj/project.pbxproj

@@ -0,0 +1,330 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 46;
+	objects = {
+
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+		D2010EFB1B0E8A8D00BD0BDF /* ElephantSeals.mov in Resources */ = {isa = PBXBuildFile; fileRef = D2010EFA1B0E8A8D00BD0BDF /* ElephantSeals.mov */; };
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+/* End PBXBuildFile section */
+
+/* Begin PBXFileReference section */
+		D2010EFA1B0E8A8D00BD0BDF /* ElephantSeals.mov */ = {isa = PBXFileReference; lastKnownFileType = video.quicktime; name = ElephantSeals.mov; path = ../Common/ElephantSeals.mov; sourceTree = SOURCE_ROOT; };
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+			isa = PBXGroup;
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+				D2010EFA1B0E8A8D00BD0BDF /* ElephantSeals.mov */,
+			);
+			name = Common;
+			sourceTree = "<group>";
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+		D2385B391AF5181400DC8ADE = {
+			isa = PBXGroup;
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+			isa = PBXGroup;
+			children = (
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+				D23E499D1B0D2DF90013F574 /* AAPLAppDelegate.h */,
+				D20EB3C11AF94FDE0059CD72 /* AAPLPlayerViewController.m */,
+				D23E49A01B0D325D0013F574 /* AAPLPlayerViewController.h */,
+				D274899E1B1CD92F0020D82A /* AAPLPlayerView.h */,
+				D274899F1B1CD92F0020D82A /* AAPLPlayerView.m */,
+				D2385B491AF5181400DC8ADE /* Main.storyboard */,
+				D2385B4C1AF5181400DC8ADE /* Images.xcassets */,
+				D2385B511AF5181400DC8ADE /* Info.plist */,
+				D27489A11B1CD9370020D82A /* Localizable.strings */,
+				D2C148E31B0FA76B004F41DA /* Supporting Files */,
+				D2010EFD1B0E8AD600BD0BDF /* Common */,
+			);
+			path = "AVFoundationSimplePlayer-iOS";
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+			buildRules = (
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+			dependencies = (
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+				D2385B4D1AF5181400DC8ADE /* Images.xcassets in Resources */,
+				D2010EFB1B0E8A8D00BD0BDF /* ElephantSeals.mov in Resources */,
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+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
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+				MTL_ENABLE_DEBUG_INFO = YES;
+				ONLY_ACTIVE_ARCH = YES;
+				SDKROOT = iphoneos;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Debug;
+		};
+		D2385B5E1AF5181400DC8ADE /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				CODE_SIGN_IDENTITY = "iPhone Developer";
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
+				ENABLE_NS_ASSERTIONS = NO;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
+				MTL_ENABLE_DEBUG_INFO = NO;
+				SDKROOT = iphoneos;
+				TARGETED_DEVICE_FAMILY = "1,2";
+				VALIDATE_PRODUCT = YES;
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+			name = Release;
+		};
+		D2385B601AF5181400DC8ADE /* Debug */ = {
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+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CLANG_ENABLE_MODULES = YES;
+				CODE_SIGN_IDENTITY = "iPhone Developer";
+				INFOPLIST_FILE = "AVFoundationSimplePlayer-iOS/Info.plist";
+				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
+				PRODUCT_NAME = "AVFoundationSimplePlayer-ObjC";
+			};
+			name = Debug;
+		};
+		D2385B611AF5181400DC8ADE /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CLANG_ENABLE_MODULES = YES;
+				CODE_SIGN_IDENTITY = "iPhone Developer";
+				INFOPLIST_FILE = "AVFoundationSimplePlayer-iOS/Info.plist";
+				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
+				PRODUCT_NAME = "AVFoundationSimplePlayer-ObjC";
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		D2385B3D1AF5181400DC8ADE /* Build configuration list for PBXProject "AVFoundationSimplePlayer-iOS" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				D2385B5D1AF5181400DC8ADE /* Debug */,
+				D2385B5E1AF5181400DC8ADE /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		D2385B5F1AF5181400DC8ADE /* Build configuration list for PBXNativeTarget "AVFoundationSimplePlayer-iOS" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				D2385B601AF5181400DC8ADE /* Debug */,
+				D2385B611AF5181400DC8ADE /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = D2385B3A1AF5181400DC8ADE /* Project object */;
+}

AVFoundationSimplePlayer/Objective-C/AVFoundationSimplePlayer-iOS/AAPLAppDelegate.h

@@ -0,0 +1,17 @@
+/*
+	Copyright (C) 2016 Apple Inc. All Rights Reserved.
+	See LICENSE.txt for this sample’s licensing information
+	
+	Abstract:
+	Application delegate.
+*/
+
+@import UIKit;
+
+
+@interface AAPLAppDelegate : UIResponder <UIApplicationDelegate>
+
+@property (strong, nonatomic) UIWindow *window;
+
+@end
+

AVFoundationSimplePlayer/Objective-C/AVFoundationSimplePlayer-iOS/AAPLAppDelegate.m

@@ -0,0 +1,13 @@
+/*
+    Copyright (C) 2016 Apple Inc. All Rights Reserved.
+    See LICENSE.txt for this sample’s licensing information
+    
+    Abstract:
+    Application delegate.
+*/
+
+#import "AAPLAppDelegate.h"
+
+
+@implementation AAPLAppDelegate
+@end

AVFoundationSimplePlayer/Objective-C/AVFoundationSimplePlayer-iOS/AAPLPlayerView.h

@@ -0,0 +1,16 @@
+/*
+	Copyright (C) 2016 Apple Inc. All Rights Reserved.
+	See LICENSE.txt for this sample’s licensing information
+	
+	Abstract:
+	View containing an AVPlayerLayer.
+*/
+
+@import UIKit;
+
+@class AVPlayer;
+
+@interface AAPLPlayerView : UIView
+@property AVPlayer *player;
+@property (readonly) AVPlayerLayer *playerLayer;
+@end

AVFoundationSimplePlayer/Objective-C/AVFoundationSimplePlayer-iOS/AAPLPlayerView.m

@@ -0,0 +1,34 @@
+/*
+    Copyright (C) 2016 Apple Inc. All Rights Reserved.
+    See LICENSE.txt for this sample’s licensing information
+    
+    Abstract:
+    View containing an AVPlayerLayer.
+*/
+
+@import Foundation;
+@import AVFoundation;
+#import "AAPLPlayerView.h"
+
+
+@implementation AAPLPlayerView
+
+- (AVPlayer *)player {
+    return self.playerLayer.player;
+}
+
+- (void)setPlayer:(AVPlayer *)player {
+    self.playerLayer.player = player;
+}
+
+// override UIView
++ (Class)layerClass {
+    return [AVPlayerLayer class];
+}
+
+- (AVPlayerLayer *)playerLayer {
+    return (AVPlayerLayer *)self.layer;
+}
+
+@end
+

AVFoundationSimplePlayer/Objective-C/AVFoundationSimplePlayer-iOS/AAPLPlayerViewController.h

@@ -0,0 +1,32 @@
+/*
+	Copyright (C) 2016 Apple Inc. All Rights Reserved.
+	See LICENSE.txt for this sample’s licensing information
+	
+	Abstract:
+	View controller containing a player view and basic playback controls.
+*/
+
+@import UIKit;
+
+
+@class AAPLPlayerView;
+
+@interface AAPLPlayerViewController : UIViewController
+
+@property (readonly) AVPlayer *player;
+@property AVURLAsset *asset;
+
+@property CMTime currentTime;
+@property (readonly) CMTime duration;
+@property float rate;
+
+@property (weak) IBOutlet UISlider *timeSlider;
+@property (weak) IBOutlet UILabel *startTimeLabel;
+@property (weak) IBOutlet UILabel *durationLabel;
+@property (weak) IBOutlet UIButton *rewindButton;
+@property (weak) IBOutlet UIButton *playPauseButton;
+@property (weak) IBOutlet UIButton *fastForwardButton;
+@property (weak) IBOutlet AAPLPlayerView *playerView;
+
+@end
+

AVFoundationSimplePlayer/Objective-C/AVFoundationSimplePlayer-iOS/AAPLPlayerViewController.m

@@ -0,0 +1,316 @@
+/*
+    Copyright (C) 2016 Apple Inc. All Rights Reserved.
+    See LICENSE.txt for this sample’s licensing information
+    
+    Abstract:
+    View controller containing a player view and basic playback controls.
+*/
+
+
+@import Foundation;
+@import AVFoundation;
+@import CoreMedia.CMTime;
+#import "AAPLPlayerViewController.h"
+#import "AAPLPlayerView.h"
+
+
+// Private properties
+@interface AAPLPlayerViewController ()
+{
+    AVPlayer *_player;
+    AVURLAsset *_asset;
+    id<NSObject> _timeObserverToken;
+    AVPlayerItem *_playerItem;
+}
+
+@property AVPlayerItem *playerItem;
+
+@property (readonly) AVPlayerLayer *playerLayer;
+
+@end
+
+@implementation AAPLPlayerViewController
+
+// MARK: - View Handling
+
+/*
+	KVO context used to differentiate KVO callbacks for this class versus other
+	classes in its class hierarchy.
+*/
+static int AAPLPlayerViewControllerKVOContext = 0;
+
+- (void)viewWillAppear:(BOOL)animated {
+    [super viewWillAppear:animated];
+
+    /*
+        Update the UI when these player properties change.
+    
+        Use the context parameter to distinguish KVO for our particular observers and not
+        those destined for a subclass that also happens to be observing these properties.
+    */
+    [self addObserver:self forKeyPath:@"asset" options:NSKeyValueObservingOptionNew context:&AAPLPlayerViewControllerKVOContext];
+    [self addObserver:self forKeyPath:@"player.currentItem.duration" options:NSKeyValueObservingOptionNew | NSKeyValueObservingOptionInitial context:&AAPLPlayerViewControllerKVOContext];
+    [self addObserver:self forKeyPath:@"player.rate" options:NSKeyValueObservingOptionNew | NSKeyValueObservingOptionInitial context:&AAPLPlayerViewControllerKVOContext];
+    [self addObserver:self forKeyPath:@"player.currentItem.status" options:NSKeyValueObservingOptionNew | NSKeyValueObservingOptionInitial context:&AAPLPlayerViewControllerKVOContext];
+
+    self.playerView.playerLayer.player = self.player;
+
+    NSURL *movieURL = [[NSBundle mainBundle] URLForResource:@"ElephantSeals" withExtension:@"mov"];
+    self.asset = [AVURLAsset assetWithURL:movieURL];
+
+    // Use a weak self variable to avoid a retain cycle in the block.
+    AAPLPlayerViewController __weak *weakSelf = self;
+    _timeObserverToken = [self.player addPeriodicTimeObserverForInterval:CMTimeMake(1, 1) queue:dispatch_get_main_queue() usingBlock:
+        ^(CMTime time) {
+            weakSelf.timeSlider.value = CMTimeGetSeconds(time);
+        }];
+}
+
+- (void)viewDidDisappear:(BOOL)animated {
+    [super viewDidDisappear:animated];
+
+    if (_timeObserverToken) {
+        [self.player removeTimeObserver:_timeObserverToken];
+        _timeObserverToken = nil;
+    }
+
+    [self.player pause];
+
+    [self removeObserver:self forKeyPath:@"asset" context:&AAPLPlayerViewControllerKVOContext];
+    [self removeObserver:self forKeyPath:@"player.currentItem.duration" context:&AAPLPlayerViewControllerKVOContext];
+    [self removeObserver:self forKeyPath:@"player.rate" context:&AAPLPlayerViewControllerKVOContext];
+    [self removeObserver:self forKeyPath:@"player.currentItem.status" context:&AAPLPlayerViewControllerKVOContext];
+}
+
+// MARK: - Properties
+
+// Will attempt load and test these asset keys before playing
++ (NSArray *)assetKeysRequiredToPlay {
+    return @[ @"playable", @"hasProtectedContent" ];
+}
+
+- (AVPlayer *)player {
+    if (!_player)
+        _player = [[AVPlayer alloc] init];
+    return _player;
+}
+
+- (CMTime)currentTime {
+    return self.player.currentTime;
+}
+- (void)setCurrentTime:(CMTime)newCurrentTime {
+    [self.player seekToTime:newCurrentTime toleranceBefore:kCMTimeZero toleranceAfter:kCMTimeZero];
+}
+
+- (CMTime)duration {
+    return self.player.currentItem ? self.player.currentItem.duration : kCMTimeZero;
+}
+
+- (float)rate {
+    return self.player.rate;
+}
+- (void)setRate:(float)newRate {
+    self.player.rate = newRate;
+}
+
+- (AVPlayerLayer *)playerLayer {
+    return self.playerView.playerLayer;
+}
+
+- (AVPlayerItem *)playerItem {
+    return _playerItem;
+}
+
+- (void)setPlayerItem:(AVPlayerItem *)newPlayerItem {
+    if (_playerItem != newPlayerItem) {
+
+        _playerItem = newPlayerItem;
+    
+        // If needed, configure player item here before associating it with a player
+        // (example: adding outputs, setting text style rules, selecting media options)
+        [self.player replaceCurrentItemWithPlayerItem:_playerItem];
+    }
+}
+
+// MARK: - Asset Loading
+
+- (void)asynchronouslyLoadURLAsset:(AVURLAsset *)newAsset {
+
+    /*
+        Using AVAsset now runs the risk of blocking the current thread
+        (the main UI thread) whilst I/O happens to populate the
+        properties. It's prudent to defer our work until the properties
+        we need have been loaded.
+    */
+    [newAsset loadValuesAsynchronouslyForKeys:AAPLPlayerViewController.assetKeysRequiredToPlay completionHandler:^{
+
+        /*
+            The asset invokes its completion handler on an arbitrary queue.
+            To avoid multiple threads using our internal state at the same time
+            we'll elect to use the main thread at all times, let's dispatch
+            our handler to the main queue.
+        */
+        dispatch_async(dispatch_get_main_queue(), ^{
+            
+            if (newAsset != self.asset) {
+                /*
+                    self.asset has already changed! No point continuing because
+                    another newAsset will come along in a moment.
+                */
+                return;
+            }
+        
+            /*
+                Test whether the values of each of the keys we need have been
+                successfully loaded.
+            */
+            for (NSString *key in self.class.assetKeysRequiredToPlay) {
+                NSError *error = nil;
+                if ([newAsset statusOfValueForKey:key error:&error] == AVKeyValueStatusFailed) {
+
+                    NSString *message = [NSString localizedStringWithFormat:NSLocalizedString(@"error.asset_key_%@_failed.description", @"Can't use this AVAsset because one of it's keys failed to load"), key];
+
+                    [self handleErrorWithMessage:message error:error];
+
+                    return;
+                }
+            }
+
+            // We can't play this asset.
+            if (!newAsset.playable || newAsset.hasProtectedContent) {
+                NSString *message = NSLocalizedString(@"error.asset_not_playable.description", @"Can't use this AVAsset because it isn't playable or has protected content");
+
+                [self handleErrorWithMessage:message error:nil];
+
+                return;
+            }
+
+            /*
+                We can play this asset. Create a new AVPlayerItem and make it
+                our player's current item.
+            */
+            self.playerItem = [AVPlayerItem playerItemWithAsset:newAsset];
+        });
+    }];
+}
+
+// MARK: - IBActions
+
+- (IBAction)playPauseButtonWasPressed:(UIButton *)sender {
+    if (self.player.rate != 1.0) {
+        // not playing foward so play
+        if (CMTIME_COMPARE_INLINE(self.currentTime, ==, self.duration)) {
+            // at end so got back to begining
+            self.currentTime = kCMTimeZero;
+        }
+        [self.player play];
+    } else {
+        // playing so pause
+        [self.player pause];
+    }
+}
+
+- (IBAction)rewindButtonWasPressed:(UIButton *)sender {
+    self.rate = MAX(self.player.rate - 2.0, -2.0); // rewind no faster than -2.0
+}
+
+- (IBAction)fastForwardButtonWasPressed:(UIButton *)sender {
+    self.rate = MIN(self.player.rate + 2.0, 2.0); // fast forward no faster than 2.0
+}
+
+- (IBAction)timeSliderDidChange:(UISlider *)sender {
+    self.currentTime = CMTimeMakeWithSeconds(sender.value, 1000);
+}
+
+// MARK: - KV Observation
+
+// Update our UI when player or player.currentItem changes
+- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
+
+    if (context != &AAPLPlayerViewControllerKVOContext) {
+        // KVO isn't for us.
+        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
+        return;
+    }
+
+    if ([keyPath isEqualToString:@"asset"]) {
+        if (self.asset) {
+            [self asynchronouslyLoadURLAsset:self.asset];
+        }
+    }
+    else if ([keyPath isEqualToString:@"player.currentItem.duration"]) {
+
+        // Update timeSlider and enable/disable controls when duration > 0.0
+
+        // Handle NSNull value for NSKeyValueChangeNewKey, i.e. when player.currentItem is nil
+        NSValue *newDurationAsValue = change[NSKeyValueChangeNewKey];
+        CMTime newDuration = [newDurationAsValue isKindOfClass:[NSValue class]] ? newDurationAsValue.CMTimeValue : kCMTimeZero;
+        BOOL hasValidDuration = CMTIME_IS_NUMERIC(newDuration) && newDuration.value != 0;
+        double newDurationSeconds = hasValidDuration ? CMTimeGetSeconds(newDuration) : 0.0;
+
+        self.timeSlider.maximumValue = newDurationSeconds;
+        self.timeSlider.value = hasValidDuration ? CMTimeGetSeconds(self.currentTime) : 0.0;
+        self.rewindButton.enabled = hasValidDuration;
+        self.playPauseButton.enabled = hasValidDuration;
+        self.fastForwardButton.enabled = hasValidDuration;
+        self.timeSlider.enabled = hasValidDuration;
+        self.startTimeLabel.enabled = hasValidDuration;
+        self.durationLabel.enabled = hasValidDuration;
+        int wholeMinutes = (int)trunc(newDurationSeconds / 60);
+        self.durationLabel.text = [NSString stringWithFormat:@"%d:%02d", wholeMinutes, (int)trunc(newDurationSeconds) - wholeMinutes * 60];
+
+    }
+    else if ([keyPath isEqualToString:@"player.rate"]) {
+        // Update playPauseButton image
+
+        double newRate = [change[NSKeyValueChangeNewKey] doubleValue];
+        UIImage *buttonImage = (newRate == 1.0) ? [UIImage imageNamed:@"PauseButton"] : [UIImage imageNamed:@"PlayButton"];
+        [self.playPauseButton setImage:buttonImage forState:UIControlStateNormal];
+
+    }
+    else if ([keyPath isEqualToString:@"player.currentItem.status"]) {
+        // Display an error if status becomes Failed
+
+        // Handle NSNull value for NSKeyValueChangeNewKey, i.e. when player.currentItem is nil
+        NSNumber *newStatusAsNumber = change[NSKeyValueChangeNewKey];
+        AVPlayerItemStatus newStatus = [newStatusAsNumber isKindOfClass:[NSNumber class]] ? newStatusAsNumber.integerValue : AVPlayerItemStatusUnknown;
+        
+        if (newStatus == AVPlayerItemStatusFailed) {
+            [self handleErrorWithMessage:self.player.currentItem.error.localizedDescription error:self.player.currentItem.error];
+        }
+
+    } else {
+        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
+    }
+}
+
+// Trigger KVO for anyone observing our properties affected by player and player.currentItem
++ (NSSet *)keyPathsForValuesAffectingValueForKey:(NSString *)key {
+    if ([key isEqualToString:@"duration"]) {
+        return [NSSet setWithArray:@[ @"player.currentItem.duration" ]];
+    } else if ([key isEqualToString:@"currentTime"]) {
+        return [NSSet setWithArray:@[ @"player.currentItem.currentTime" ]];
+    } else if ([key isEqualToString:@"rate"]) {
+        return [NSSet setWithArray:@[ @"player.rate" ]];
+    } else {
+        return [super keyPathsForValuesAffectingValueForKey:key];
+    }
+}
+
+// MARK: - Error Handling
+
+- (void)handleErrorWithMessage:(NSString *)message error:(NSError *)error {
+    NSLog(@"Error occured with message: %@, error: %@.", message, error);
+
+    NSString *alertTitle = NSLocalizedString(@"alert.error.title", @"Alert title for errors");
+    NSString *defaultAlertMesssage = NSLocalizedString(@"error.default.description", @"Default error message when no NSError provided");
+    UIAlertController *controller = [UIAlertController alertControllerWithTitle:alertTitle message:message ?: defaultAlertMesssage preferredStyle:UIAlertControllerStyleAlert];
+
+    NSString *alertActionTitle = NSLocalizedString(@"alert.error.actions.OK", @"OK on error alert");
+    UIAlertAction *action = [UIAlertAction actionWithTitle:alertActionTitle style:UIAlertActionStyleDefault handler:nil];
+    [controller addAction:action];
+
+    [self presentViewController:controller animated:YES completion:nil];
+}
+
+@end

AVFoundationSimplePlayer/Objective-C/AVFoundationSimplePlayer-iOS/Base.lproj/Main.storyboard

@@ -0,0 +1,136 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="8121.17" systemVersion="14E8" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="8101.14"/>
+        <capability name="Constraints to layout margins" minToolsVersion="6.0"/>
+    </dependencies>
+    <scenes>
+        <!--Player View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="AAPLPlayerViewController" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
+                        <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <button opaque="NO" contentMode="scaleToFill" enabled="NO" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="xrl-4x-Edh">
+                                <rect key="frame" x="70" y="550" width="70" height="30"/>
+                                <constraints>
+                                    <constraint firstAttribute="height" constant="30" id="5cK-ah-alZ"/>
+                                    <constraint firstAttribute="width" constant="70" id="E4B-3O-1NJ"/>
+                                </constraints>
+                                <state key="normal" image="PlayButton"/>
+                                <connections>
+                                    <action selector="playPauseButtonWasPressed:" destination="BYZ-38-t0r" eventType="touchUpInside" id="FYC-AI-liU"/>
+                                </connections>
+                            </button>
+                            <button opaque="NO" contentMode="scaleToFill" enabled="NO" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="AcP-gW-NjJ">
+                                <rect key="frame" x="140" y="550" width="70" height="30"/>
+                                <constraints>
+                                    <constraint firstAttribute="height" constant="30" id="Ds3-V4-PI5"/>
+                                    <constraint firstAttribute="width" constant="70" id="cXK-QP-qNN"/>
+                                </constraints>
+                                <state key="normal" image="ScanForwardButton"/>
+                                <connections>
+                                    <action selector="fastForwardButtonWasPressed:" destination="BYZ-38-t0r" eventType="touchUpInside" id="9VR-W7-z4u"/>
+                                </connections>
+                            </button>
+                            <slider opaque="NO" contentMode="scaleToFill" enabled="NO" contentHorizontalAlignment="center" contentVerticalAlignment="center" value="0.5" minValue="0.0" maxValue="1" translatesAutoresizingMaskIntoConstraints="NO" id="zs2-tO-O9K">
+                                <rect key="frame" x="218" y="550" width="364" height="31"/>
+                                <constraints>
+                                    <constraint firstAttribute="height" constant="30" id="Wah-wD-K8s"/>
+                                </constraints>
+                                <connections>
+                                    <action selector="timeSliderDidChange:" destination="BYZ-38-t0r" eventType="valueChanged" id="iEm-kp-I1a"/>
+                                </connections>
+                            </slider>
+                            <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="k2B-HR-6u1" customClass="AAPLPlayerView">
+                                <rect key="frame" x="0.0" y="20" width="600" height="500"/>
+                                <color key="backgroundColor" white="0.0" alpha="1" colorSpace="calibratedWhite"/>
+                            </view>
+                            <button opaque="NO" contentMode="scaleToFill" enabled="NO" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="1Ph-2J-7JL">
+                                <rect key="frame" x="0.0" y="550" width="70" height="30"/>
+                                <constraints>
+                                    <constraint firstAttribute="width" constant="70" id="0HV-El-Nhy"/>
+                                    <constraint firstAttribute="height" constant="30" id="Ju6-Bx-wC5"/>
+                                </constraints>
+                                <state key="normal" image="ScanBackwardButton"/>
+                                <connections>
+                                    <action selector="rewindButtonWasPressed:" destination="BYZ-38-t0r" eventType="touchUpInside" id="a5z-7z-Dbp"/>
+                                </connections>
+                            </button>
+                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="0:00" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" enabled="NO" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="lSE-mk-Glu" userLabel="StartTime">
+                                <rect key="frame" x="220" y="530" width="50" height="20"/>
+                                <constraints>
+                                    <constraint firstAttribute="height" constant="20" id="3FX-0e-O6P"/>
+                                    <constraint firstAttribute="width" constant="50" id="FxO-it-ceh"/>
+                                </constraints>
+                                <fontDescription key="fontDescription" style="UICTFontTextStyleCaption1"/>
+                                <nil key="highlightedColor"/>
+                            </label>
+                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="-:--" textAlignment="right" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" enabled="NO" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="qOC-Kz-nZX" userLabel="Duration">
+                                <rect key="frame" x="530" y="530" width="50" height="20"/>
+                                <constraints>
+                                    <constraint firstAttribute="width" constant="50" id="dHY-sI-1Zo"/>
+                                    <constraint firstAttribute="height" constant="20" id="vny-2p-5hq"/>
+                                </constraints>
+                                <fontDescription key="fontDescription" style="UICTFontTextStyleCaption1"/>
+                                <nil key="highlightedColor"/>
+                            </label>
+                        </subviews>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
+                        <constraints>
+                            <constraint firstItem="zs2-tO-O9K" firstAttribute="leading" secondItem="lSE-mk-Glu" secondAttribute="leading" id="0Nl-Eq-0C9"/>
+                            <constraint firstItem="AcP-gW-NjJ" firstAttribute="leading" secondItem="xrl-4x-Edh" secondAttribute="trailing" id="0Xi-o4-GPm"/>
+                            <constraint firstItem="k2B-HR-6u1" firstAttribute="top" secondItem="y3c-jy-aDJ" secondAttribute="bottom" id="8RV-Wu-cZ2"/>
+                            <constraint firstItem="wfy-db-euE" firstAttribute="top" secondItem="1Ph-2J-7JL" secondAttribute="bottom" constant="20" id="AN8-Ow-vgP"/>
+                            <constraint firstItem="zs2-tO-O9K" firstAttribute="leading" secondItem="AcP-gW-NjJ" secondAttribute="trailing" constant="10" id="Djj-sA-9ve"/>
+                            <constraint firstItem="qOC-Kz-nZX" firstAttribute="trailing" secondItem="zs2-tO-O9K" secondAttribute="trailing" id="Ny2-em-Hsb"/>
+                            <constraint firstAttribute="trailingMargin" secondItem="k2B-HR-6u1" secondAttribute="trailing" constant="-20" id="SHT-LM-7fv"/>
+                            <constraint firstItem="zs2-tO-O9K" firstAttribute="width" secondItem="lSE-mk-Glu" secondAttribute="width" id="UTA-oc-lgo"/>
+                            <constraint firstItem="zs2-tO-O9K" firstAttribute="centerY" secondItem="AcP-gW-NjJ" secondAttribute="centerY" id="aUq-JI-udW"/>
+                            <constraint firstItem="zs2-tO-O9K" firstAttribute="centerX" secondItem="lSE-mk-Glu" secondAttribute="centerX" id="eau-ex-HCT"/>
+                            <constraint firstItem="k2B-HR-6u1" firstAttribute="top" secondItem="8bC-Xf-vdC" secondAttribute="topMargin" constant="70" id="fr7-hU-dZX"/>
+                            <constraint firstItem="xrl-4x-Edh" firstAttribute="centerY" secondItem="1Ph-2J-7JL" secondAttribute="centerY" id="gSS-SM-9qW"/>
+                            <constraint firstItem="k2B-HR-6u1" firstAttribute="leading" secondItem="8bC-Xf-vdC" secondAttribute="leadingMargin" constant="-20" id="hIA-sm-1WB"/>
+                            <constraint firstItem="AcP-gW-NjJ" firstAttribute="centerY" secondItem="xrl-4x-Edh" secondAttribute="centerY" id="hnG-E0-mGw"/>
+                            <constraint firstItem="1Ph-2J-7JL" firstAttribute="leading" secondItem="8bC-Xf-vdC" secondAttribute="leadingMargin" constant="-20" id="iAK-lW-ewa"/>
+                            <constraint firstItem="zs2-tO-O9K" firstAttribute="trailing" secondItem="8bC-Xf-vdC" secondAttribute="trailingMargin" id="ill-9D-3bq"/>
+                            <constraint firstItem="zs2-tO-O9K" firstAttribute="top" secondItem="lSE-mk-Glu" secondAttribute="bottom" id="jXv-uJ-vtR"/>
+                            <constraint firstItem="zs2-tO-O9K" firstAttribute="top" secondItem="qOC-Kz-nZX" secondAttribute="bottom" id="mP2-9X-QOD"/>
+                            <constraint firstItem="xrl-4x-Edh" firstAttribute="leading" secondItem="1Ph-2J-7JL" secondAttribute="trailing" id="nWe-M1-J3B"/>
+                            <constraint firstItem="wfy-db-euE" firstAttribute="top" secondItem="k2B-HR-6u1" secondAttribute="bottom" constant="80" id="zi6-Fl-Tea"/>
+                        </constraints>
+                        <variation key="default">
+                            <mask key="constraints">
+                                <exclude reference="fr7-hU-dZX"/>
+                                <exclude reference="UTA-oc-lgo"/>
+                                <exclude reference="eau-ex-HCT"/>
+                            </mask>
+                        </variation>
+                    </view>
+                    <connections>
+                        <outlet property="durationLabel" destination="qOC-Kz-nZX" id="vdA-zn-17E"/>
+                        <outlet property="fastForwardButton" destination="AcP-gW-NjJ" id="bVk-tK-Ap4"/>
+                        <outlet property="playPauseButton" destination="xrl-4x-Edh" id="BeD-Na-Ocg"/>
+                        <outlet property="playerView" destination="k2B-HR-6u1" id="w2i-er-gei"/>
+                        <outlet property="rewindButton" destination="1Ph-2J-7JL" id="Fwp-1T-h4Q"/>
+                        <outlet property="startTimeLabel" destination="lSE-mk-Glu" id="0k2-Ci-tDY"/>
+                        <outlet property="timeSlider" destination="zs2-tO-O9K" id="BKu-N7-khJ"/>
+                    </connections>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="357" y="421"/>
+        </scene>
+    </scenes>
+    <resources>
+        <image name="PlayButton" width="21" height="22"/>
+        <image name="ScanBackwardButton" width="29" height="16"/>
+        <image name="ScanForwardButton" width="29" height="16"/>
+    </resources>
+</document>

AVFoundationSimplePlayer/Objective-C/AVFoundationSimplePlayer-iOS/Images.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,68 @@
+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "76x76",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "76x76",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

AVFoundationSimplePlayer/Objective-C/AVFoundationSimplePlayer-iOS/Images.xcassets/PauseButton.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "PauseButton.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "PauseButton@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "PauseButton@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

AVFoundationSimplePlayer/Objective-C/AVFoundationSimplePlayer-iOS/Images.xcassets/PlayButton.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "PlayButton.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "PlayButton@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "PlayButton@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

AVFoundationSimplePlayer/Objective-C/AVFoundationSimplePlayer-iOS/Images.xcassets/ScanBackwardButton.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "ScanBackwardButton.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "ScanBackwardButton@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "ScanBackwardButton@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

AVFoundationSimplePlayer/Objective-C/AVFoundationSimplePlayer-iOS/Images.xcassets/ScanForwardButton.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "ScanForwardButton.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "ScanForwardButton@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "ScanForwardButton@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

AVFoundationSimplePlayer/Objective-C/AVFoundationSimplePlayer-iOS/Info.plist

@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>com.example.apple-samplecode.$(PRODUCT_NAME:rfc1034identifier)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>Main</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+	<key>UIRequiresFullScreen</key>
+	<true/>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>

AVFoundationSimplePlayer/Objective-C/AVFoundationSimplePlayer-iOS/en.lproj/Localizable.strings

@@ -0,0 +1,22 @@
+/*
+	<samplecode>
+		<abstract>
+			Localizable strings.
+		</abstract>
+	</samplecode>
+*/
+
+// Alert title for errors.
+"alert.error.title" = "Error";
+
+// OK action on error alert
+"alert.error.actions.OK" = "OK on error alert";
+
+// Can't use this AVAsset because one of it's keys failed to load.
+"error.asset_key_%@_failed.description" = "Media failed to load key \"%@\"";
+
+// Can't use this AVAsset because it isn't playable or has protected content.
+"error.asset_not_playable.description" = "Media isn't playable or has protected content";
+
+// Default error message when no NSError provided.
+"error.default.description" = "Unknown error";

AVFoundationSimplePlayer/Objective-C/AVFoundationSimplePlayer-iOS/main.m

@@ -0,0 +1,59 @@
+/*
+	File: AAPLAppDelegate.m
+
+	Abstract: Sample code for AVFoundationSimplePlayer-ObjC-iOS
+
+	Version: 1.0
+
+	Disclaimer: IMPORTANT:  This Apple software is supplied to you by 
+	Apple Inc. ("Apple") in consideration of your agreement to the
+	following terms, and your use, installation, modification or
+	redistribution of this Apple software constitutes acceptance of these
+	terms.  If you do not agree with these terms, please do not use,
+	install, modify or redistribute this Apple software.
+
+	In consideration of your agreement to abide by the following terms, and
+	subject to these terms, Apple grants you a personal, non-exclusive
+	license, under Apple's copyrights in this original Apple software (the
+	"Apple Software"), to use, reproduce, modify and redistribute the Apple
+	Software, with or without modifications, in source and/or binary forms;
+	provided that if you redistribute the Apple Software in its entirety and
+	without modifications, you must retain this notice and the following
+	text and disclaimers in all such redistributions of the Apple Software. 
+	Neither the name, trademarks, service marks or logos of Apple Inc. 
+	may be used to endorse or promote products derived from the Apple
+	Software without specific prior written permission from Apple.  Except
+	as expressly stated in this notice, no other rights or licenses, express
+	or implied, are granted by Apple herein, including but not limited to
+	any patent rights that may be infringed by your derivative works or by
+	other works in which the Apple Software may be incorporated.
+
+	The Apple Software is provided by Apple on an "AS IS" basis.  APPLE
+	MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
+	THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
+	FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
+	OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
+
+	IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
+	OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+	SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+	INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
+	MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
+	AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
+	STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
+	POSSIBILITY OF SUCH DAMAGE.
+
+	Copyright (C) 2013-2015 Apple Inc. All Rights Reserved.
+*/
+
+#import <UIKit/UIKit.h>
+#import "AAPLAppDelegate.h"
+
+
+
+
+int main(int argc, char * argv[]) {
+    @autoreleasepool {
+        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AAPLAppDelegate class]));
+    }
+}

AVFoundationSimplePlayer/README.md

@@ -0,0 +1,15 @@
+# AVFoundationSimplePlayer-iOS: Using AVFoundation to Play Media
+
+Demonstrates how to create a simple movie playback app using only the AVPlayer and AVPlayerLayer classes from AVFoundation (not AVKit). You'll see how to load a movie file as an AVAsset and then how to implement various functionality including play, pause, fast forward, rewind, time slider updating, and scrubbing.
+
+## Requirements
+
+### Build
+
+Xcode 8.0, iOS 9.0 SDK
+
+### Runtime
+
+iOS 9.0 or later
+
+Copyright (C) 2016 Apple Inc. All rights reserved.

AVFoundationSimplePlayer/Swift/AVFoundationSimplePlayer-iOS.xcodeproj/project.pbxproj

@@ -0,0 +1,322 @@
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+
+/* Begin XCConfigurationList section */
+		D2385B3D1AF5181400DC8ADE /* Build configuration list for PBXProject "AVFoundationSimplePlayer-iOS" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				D2385B5D1AF5181400DC8ADE /* Debug */,
+				D2385B5E1AF5181400DC8ADE /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		D2385B5F1AF5181400DC8ADE /* Build configuration list for PBXNativeTarget "AVFoundationSimplePlayer-iOS" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				D2385B601AF5181400DC8ADE /* Debug */,
+				D2385B611AF5181400DC8ADE /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = D2385B3A1AF5181400DC8ADE /* Project object */;
+}

AVFoundationSimplePlayer/Swift/AVFoundationSimplePlayer-iOS/AppDelegate.swift

@@ -0,0 +1,16 @@
+/*
+	Copyright (C) 2016 Apple Inc. All Rights Reserved.
+	See LICENSE.txt for this sample’s licensing information
+	
+	Abstract:
+	Main application entry point.
+*/
+
+import UIKit
+
+@UIApplicationMain
+class AppDelegate: UIResponder, UIApplicationDelegate {
+    // MARK: Properties
+    
+    var window: UIWindow?
+}

AVFoundationSimplePlayer/Swift/AVFoundationSimplePlayer-iOS/Base.lproj/Main.storyboard

@@ -0,0 +1,138 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="8121.17" systemVersion="14E8" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="8101.14"/>
+        <capability name="Constraints to layout margins" minToolsVersion="6.0"/>
+    </dependencies>
+    <scenes>
+        <!--Player View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="PlayerViewController" customModule="AVFoundationSimplePlayer_Swift" customModuleProvider="target" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
+                        <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <button opaque="NO" contentMode="scaleToFill" enabled="NO" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="xrl-4x-Edh">
+                                <rect key="frame" x="70" y="550" width="70" height="30"/>
+                                <constraints>
+                                    <constraint firstAttribute="height" constant="30" id="5cK-ah-alZ"/>
+                                    <constraint firstAttribute="width" constant="70" id="E4B-3O-1NJ"/>
+                                </constraints>
+                                <state key="normal" image="PlayButton"/>
+                                <connections>
+                                    <action selector="playPauseButtonWasPressed:" destination="BYZ-38-t0r" eventType="touchUpInside" id="FYC-AI-liU"/>
+                                </connections>
+                            </button>
+                            <button opaque="NO" contentMode="scaleToFill" enabled="NO" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="AcP-gW-NjJ">
+                                <rect key="frame" x="140" y="550" width="70" height="30"/>
+                                <constraints>
+                                    <constraint firstAttribute="height" constant="30" id="Ds3-V4-PI5"/>
+                                    <constraint firstAttribute="width" constant="70" id="cXK-QP-qNN"/>
+                                </constraints>
+                                <state key="normal" image="ScanForwardButton"/>
+                                <connections>
+                                    <action selector="fastForwardButtonWasPressed:" destination="BYZ-38-t0r" eventType="touchUpInside" id="9VR-W7-z4u"/>
+                                </connections>
+                            </button>
+                            <slider opaque="NO" contentMode="scaleToFill" enabled="NO" contentHorizontalAlignment="center" contentVerticalAlignment="center" value="0.5" minValue="0.0" maxValue="1" translatesAutoresizingMaskIntoConstraints="NO" id="zs2-tO-O9K">
+                                <rect key="frame" x="218" y="550" width="364" height="31"/>
+                                <constraints>
+                                    <constraint firstAttribute="height" constant="30" id="Wah-wD-K8s"/>
+                                </constraints>
+                                <connections>
+                                    <action selector="timeSliderDidChange:" destination="BYZ-38-t0r" eventType="valueChanged" id="iEm-kp-I1a"/>
+                                </connections>
+                            </slider>
+                            <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="k2B-HR-6u1" customClass="PlayerView" customModule="AVFoundationSimplePlayer_Swift" customModuleProvider="target">
+                                <rect key="frame" x="0.0" y="20" width="600" height="500"/>
+                                <color key="backgroundColor" white="0.0" alpha="1" colorSpace="calibratedWhite"/>
+                            </view>
+                            <button opaque="NO" contentMode="scaleToFill" enabled="NO" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="1Ph-2J-7JL">
+                                <rect key="frame" x="0.0" y="550" width="70" height="30"/>
+                                <constraints>
+                                    <constraint firstAttribute="width" constant="70" id="0HV-El-Nhy"/>
+                                    <constraint firstAttribute="height" constant="30" id="Ju6-Bx-wC5"/>
+                                </constraints>
+                                <state key="normal" image="ScanBackwardButton"/>
+                                <connections>
+                                    <action selector="rewindButtonWasPressed:" destination="BYZ-38-t0r" eventType="touchUpInside" id="a5z-7z-Dbp"/>
+                                </connections>
+                            </button>
+                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="0:00" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" enabled="NO" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="lSE-mk-Glu" userLabel="StartTime">
+                                <rect key="frame" x="220" y="530" width="50" height="20"/>
+                                <constraints>
+                                    <constraint firstAttribute="height" constant="20" id="3FX-0e-O6P"/>
+                                    <constraint firstAttribute="width" constant="50" id="FxO-it-ceh"/>
+                                </constraints>
+                                <fontDescription key="fontDescription" style="UICTFontTextStyleCaption1"/>
+                                <nil key="highlightedColor"/>
+                            </label>
+                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="-:--" textAlignment="right" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" enabled="NO" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="qOC-Kz-nZX" userLabel="Duration">
+                                <rect key="frame" x="530" y="530" width="50" height="20"/>
+                                <constraints>
+                                    <constraint firstAttribute="width" constant="50" id="dHY-sI-1Zo"/>
+                                    <constraint firstAttribute="height" constant="20" id="vny-2p-5hq"/>
+                                </constraints>
+                                <fontDescription key="fontDescription" style="UICTFontTextStyleCaption1"/>
+                                <nil key="highlightedColor"/>
+                            </label>
+                        </subviews>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
+                        <constraints>
+                            <constraint firstItem="zs2-tO-O9K" firstAttribute="leading" secondItem="lSE-mk-Glu" secondAttribute="leading" id="0Nl-Eq-0C9"/>
+                            <constraint firstItem="AcP-gW-NjJ" firstAttribute="leading" secondItem="xrl-4x-Edh" secondAttribute="trailing" id="0Xi-o4-GPm"/>
+                            <constraint firstItem="k2B-HR-6u1" firstAttribute="top" secondItem="y3c-jy-aDJ" secondAttribute="bottom" id="8RV-Wu-cZ2"/>
+                            <constraint firstItem="zs2-tO-O9K" firstAttribute="leading" secondItem="AcP-gW-NjJ" secondAttribute="trailing" constant="10" id="Djj-sA-9ve"/>
+                            <constraint firstItem="qOC-Kz-nZX" firstAttribute="trailing" secondItem="zs2-tO-O9K" secondAttribute="trailing" id="Ny2-em-Hsb"/>
+                            <constraint firstAttribute="trailingMargin" secondItem="k2B-HR-6u1" secondAttribute="trailing" constant="-20" id="SHT-LM-7fv"/>
+                            <constraint firstItem="zs2-tO-O9K" firstAttribute="width" secondItem="lSE-mk-Glu" secondAttribute="width" id="UTA-oc-lgo"/>
+                            <constraint firstItem="zs2-tO-O9K" firstAttribute="centerY" secondItem="AcP-gW-NjJ" secondAttribute="centerY" id="aUq-JI-udW"/>
+                            <constraint firstItem="wfy-db-euE" firstAttribute="top" secondItem="1Ph-2J-7JL" secondAttribute="bottom" constant="20" id="dYL-aD-qru"/>
+                            <constraint firstItem="zs2-tO-O9K" firstAttribute="centerX" secondItem="lSE-mk-Glu" secondAttribute="centerX" id="eau-ex-HCT"/>
+                            <constraint firstItem="k2B-HR-6u1" firstAttribute="top" secondItem="8bC-Xf-vdC" secondAttribute="topMargin" constant="70" id="fr7-hU-dZX"/>
+                            <constraint firstItem="xrl-4x-Edh" firstAttribute="centerY" secondItem="1Ph-2J-7JL" secondAttribute="centerY" id="gSS-SM-9qW"/>
+                            <constraint firstItem="k2B-HR-6u1" firstAttribute="leading" secondItem="8bC-Xf-vdC" secondAttribute="leadingMargin" constant="-20" id="hIA-sm-1WB"/>
+                            <constraint firstItem="AcP-gW-NjJ" firstAttribute="centerY" secondItem="xrl-4x-Edh" secondAttribute="centerY" id="hnG-E0-mGw"/>
+                            <constraint firstItem="zs2-tO-O9K" firstAttribute="trailing" secondItem="8bC-Xf-vdC" secondAttribute="trailingMargin" id="ill-9D-3bq"/>
+                            <constraint firstItem="zs2-tO-O9K" firstAttribute="top" secondItem="lSE-mk-Glu" secondAttribute="bottom" id="jXv-uJ-vtR"/>
+                            <constraint firstItem="1Ph-2J-7JL" firstAttribute="leading" secondItem="8bC-Xf-vdC" secondAttribute="leadingMargin" constant="-20" id="kCK-L8-VXv"/>
+                            <constraint firstItem="zs2-tO-O9K" firstAttribute="top" secondItem="qOC-Kz-nZX" secondAttribute="bottom" id="mP2-9X-QOD"/>
+                            <constraint firstItem="xrl-4x-Edh" firstAttribute="leading" secondItem="1Ph-2J-7JL" secondAttribute="trailing" id="nWe-M1-J3B"/>
+                            <constraint firstItem="1Ph-2J-7JL" firstAttribute="leading" secondItem="8bC-Xf-vdC" secondAttribute="leadingMargin" constant="20" id="pTa-hD-fe7"/>
+                            <constraint firstItem="wfy-db-euE" firstAttribute="top" secondItem="k2B-HR-6u1" secondAttribute="bottom" constant="80" id="zi6-Fl-Tea"/>
+                        </constraints>
+                        <variation key="default">
+                            <mask key="constraints">
+                                <exclude reference="fr7-hU-dZX"/>
+                                <exclude reference="pTa-hD-fe7"/>
+                                <exclude reference="UTA-oc-lgo"/>
+                                <exclude reference="eau-ex-HCT"/>
+                            </mask>
+                        </variation>
+                    </view>
+                    <connections>
+                        <outlet property="durationLabel" destination="qOC-Kz-nZX" id="vdA-zn-17E"/>
+                        <outlet property="fastForwardButton" destination="AcP-gW-NjJ" id="bVk-tK-Ap4"/>
+                        <outlet property="playPauseButton" destination="xrl-4x-Edh" id="BeD-Na-Ocg"/>
+                        <outlet property="playerView" destination="k2B-HR-6u1" id="w2i-er-gei"/>
+                        <outlet property="rewindButton" destination="1Ph-2J-7JL" id="Fwp-1T-h4Q"/>
+                        <outlet property="startTimeLabel" destination="lSE-mk-Glu" id="0k2-Ci-tDY"/>
+                        <outlet property="timeSlider" destination="zs2-tO-O9K" id="BKu-N7-khJ"/>
+                    </connections>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="357" y="421"/>
+        </scene>
+    </scenes>
+    <resources>
+        <image name="PlayButton" width="21" height="22"/>
+        <image name="ScanBackwardButton" width="29" height="16"/>
+        <image name="ScanForwardButton" width="29" height="16"/>
+    </resources>
+</document>

AVFoundationSimplePlayer/Swift/AVFoundationSimplePlayer-iOS/Images.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,68 @@
+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "76x76",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "76x76",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

AVFoundationSimplePlayer/Swift/AVFoundationSimplePlayer-iOS/Images.xcassets/PauseButton.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "PauseButton.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "PauseButton@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "PauseButton@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

AVFoundationSimplePlayer/Swift/AVFoundationSimplePlayer-iOS/Images.xcassets/PlayButton.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "PlayButton.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "PlayButton@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "PlayButton@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

AVFoundationSimplePlayer/Swift/AVFoundationSimplePlayer-iOS/Images.xcassets/ScanBackwardButton.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "ScanBackwardButton.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "ScanBackwardButton@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "ScanBackwardButton@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

AVFoundationSimplePlayer/Swift/AVFoundationSimplePlayer-iOS/Images.xcassets/ScanForwardButton.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "ScanForwardButton.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "ScanForwardButton@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "ScanForwardButton@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

AVFoundationSimplePlayer/Swift/AVFoundationSimplePlayer-iOS/Info.plist

@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>Main</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+	<key>UIRequiresFullScreen</key>
+	<true/>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>

AVFoundationSimplePlayer/Swift/AVFoundationSimplePlayer-iOS/PlayerView.swift

@@ -0,0 +1,31 @@
+/*
+	Copyright (C) 2016 Apple Inc. All Rights Reserved.
+	See LICENSE.txt for this sample’s licensing information
+	
+	Abstract:
+	Player view backed by an AVPlayerLayer.
+*/
+
+import UIKit
+import AVFoundation
+
+/// A simple `UIView` subclass that is backed by an `AVPlayerLayer` layer.
+class PlayerView: UIView {
+    var player: AVPlayer? {
+        get {
+            return playerLayer.player
+        }
+        
+        set {
+            playerLayer.player = newValue
+        }
+    }
+    
+    var playerLayer: AVPlayerLayer {
+        return layer as! AVPlayerLayer
+    }
+
+    override class var layerClass: AnyClass {
+        return AVPlayerLayer.self
+    }
+}

AVFoundationSimplePlayer/Swift/AVFoundationSimplePlayer-iOS/PlayerViewController.swift

@@ -0,0 +1,359 @@
+/*
+	Copyright (C) 2016 Apple Inc. All Rights Reserved.
+	See LICENSE.txt for this sample’s licensing information
+	
+	Abstract:
+	View controller containing a player view and basic playback controls.
+*/
+
+import Foundation
+import AVFoundation
+import UIKit
+
+/*
+	KVO context used to differentiate KVO callbacks for this class versus other
+	classes in its class hierarchy.
+*/
+private var playerViewControllerKVOContext = 0
+
+class PlayerViewController: UIViewController {
+    // MARK: Properties
+    
+    // Attempt load and test these asset keys before playing.
+    static let assetKeysRequiredToPlay = [
+        "playable",
+        "hasProtectedContent"
+    ]
+
+	let player = AVPlayer()
+
+	var currentTime: Double {
+		get {
+            return CMTimeGetSeconds(player.currentTime())
+        }
+		set {
+            let newTime = CMTimeMakeWithSeconds(newValue, 1)
+			player.seek(to: newTime, toleranceBefore: kCMTimeZero, toleranceAfter: kCMTimeZero)
+		}
+	}
+
+	var duration: Double {
+        guard let currentItem = player.currentItem else { return 0.0 }
+
+        return CMTimeGetSeconds(currentItem.duration)
+	}
+
+	var rate: Float {
+		get {
+            return player.rate
+        }
+
+        set {
+            player.rate = newValue
+        }
+	}
+
+    var asset: AVURLAsset? {
+        didSet {
+            guard let newAsset = asset else { return }
+
+            asynchronouslyLoadURLAsset(newAsset)
+        }
+    }
+    
+	private var playerLayer: AVPlayerLayer? {
+        return playerView.playerLayer
+    }
+	
+	/*
+	A formatter for individual date components used to provide an appropriate
+	value for the `startTimeLabel` and `durationLabel`.
+	*/
+	let timeRemainingFormatter: DateComponentsFormatter = {
+		let formatter = DateComponentsFormatter()
+		formatter.zeroFormattingBehavior = .pad
+		formatter.allowedUnits = [.minute, .second]
+		
+		return formatter
+	}()
+
+    /*
+        A token obtained from calling `player`'s `addPeriodicTimeObserverForInterval(_:queue:usingBlock:)`
+        method.
+    */
+	private var timeObserverToken: Any?
+
+	private var playerItem: AVPlayerItem? = nil {
+        didSet {
+            /*
+                If needed, configure player item here before associating it with a player.
+                (example: adding outputs, setting text style rules, selecting media options)
+            */
+            player.replaceCurrentItem(with: self.playerItem)
+        }
+	}
+
+    // MARK: - IBOutlets
+    
+    @IBOutlet weak var timeSlider: UISlider!
+    @IBOutlet weak var startTimeLabel: UILabel!
+    @IBOutlet weak var durationLabel: UILabel!
+    @IBOutlet weak var rewindButton: UIButton!
+    @IBOutlet weak var playPauseButton: UIButton!
+    @IBOutlet weak var fastForwardButton: UIButton!
+    @IBOutlet weak var playerView: PlayerView!
+    
+    // MARK: - View Controller
+    
+    override func viewWillAppear(_ animated: Bool) {
+        super.viewWillAppear(animated)
+        
+        /*
+            Update the UI when these player properties change.
+        
+            Use the context parameter to distinguish KVO for our particular observers 
+            and not those destined for a subclass that also happens to be observing 
+            these properties.
+        */
+        addObserver(self, forKeyPath: #keyPath(PlayerViewController.player.currentItem.duration), options: [.new, .initial], context: &playerViewControllerKVOContext)
+        addObserver(self, forKeyPath: #keyPath(PlayerViewController.player.rate), options: [.new, .initial], context: &playerViewControllerKVOContext)
+        addObserver(self, forKeyPath: #keyPath(PlayerViewController.player.currentItem.status), options: [.new, .initial], context: &playerViewControllerKVOContext)
+        
+        playerView.playerLayer.player = player
+        
+        let movieURL = Bundle.main.url(forResource: "ElephantSeals", withExtension: "mov")!
+        asset = AVURLAsset(url: movieURL, options: nil)
+        
+        // Make sure we don't have a strong reference cycle by only capturing self as weak.
+        let interval = CMTimeMake(1, 1)
+		timeObserverToken = player.addPeriodicTimeObserver(forInterval: interval, queue: DispatchQueue.main) { [unowned self] time in
+			let timeElapsed = Float(CMTimeGetSeconds(time))
+			
+			self.timeSlider.value = Float(timeElapsed)
+			self.startTimeLabel.text = self.createTimeString(time: timeElapsed)
+		}
+    }
+    
+    override func viewDidDisappear(_ animated: Bool) {
+        super.viewDidDisappear(animated)
+        
+        if let timeObserverToken = timeObserverToken {
+            player.removeTimeObserver(timeObserverToken)
+            self.timeObserverToken = nil
+        }
+        
+        player.pause()
+        
+        removeObserver(self, forKeyPath: #keyPath(PlayerViewController.player.currentItem.duration), context: &playerViewControllerKVOContext)
+        removeObserver(self, forKeyPath: #keyPath(PlayerViewController.player.rate), context: &playerViewControllerKVOContext)
+        removeObserver(self, forKeyPath: #keyPath(PlayerViewController.player.currentItem.status), context: &playerViewControllerKVOContext)
+    }
+    
+    // MARK: - Asset Loading
+
+    func asynchronouslyLoadURLAsset(_ newAsset: AVURLAsset) {
+        /*
+            Using AVAsset now runs the risk of blocking the current thread (the 
+            main UI thread) whilst I/O happens to populate the properties. It's
+            prudent to defer our work until the properties we need have been loaded.
+        */
+        newAsset.loadValuesAsynchronously(forKeys: PlayerViewController.assetKeysRequiredToPlay) {
+            /*
+                The asset invokes its completion handler on an arbitrary queue. 
+                To avoid multiple threads using our internal state at the same time 
+                we'll elect to use the main thread at all times, let's dispatch
+                our handler to the main queue.
+            */
+            DispatchQueue.main.async {
+                /*
+                    `self.asset` has already changed! No point continuing because
+                    another `newAsset` will come along in a moment.
+                */
+                guard newAsset == self.asset else { return }
+
+                /*
+                    Test whether the values of each of the keys we need have been
+                    successfully loaded.
+                */
+                for key in PlayerViewController.assetKeysRequiredToPlay {
+                    var error: NSError?
+                    
+                    if newAsset.statusOfValue(forKey: key, error: &error) == .failed {
+                        let stringFormat = NSLocalizedString("error.asset_key_%@_failed.description", comment: "Can't use this AVAsset because one of it's keys failed to load")
+
+                        let message = String.localizedStringWithFormat(stringFormat, key)
+                        
+                        self.handleErrorWithMessage(message, error: error)
+                        
+                        return
+                    }
+                }
+                
+                // We can't play this asset.
+                if !newAsset.isPlayable || newAsset.hasProtectedContent {
+                    let message = NSLocalizedString("error.asset_not_playable.description", comment: "Can't use this AVAsset because it isn't playable or has protected content")
+                    
+                    self.handleErrorWithMessage(message)
+                    
+                    return
+                }
+                
+                /*
+                    We can play this asset. Create a new `AVPlayerItem` and make
+                    it our player's current item.
+                */
+                self.playerItem = AVPlayerItem(asset: newAsset)
+            }
+        }
+    }
+
+    // MARK: - IBActions
+
+	@IBAction func playPauseButtonWasPressed(_ sender: UIButton) {
+		if player.rate != 1.0 {
+            // Not playing forward, so play.
+ 			if currentTime == duration {
+                // At end, so got back to begining.
+				currentTime = 0.0
+			}
+
+			player.play()
+		}
+        else {
+            // Playing, so pause.
+			player.pause()
+		}
+	}
+	
+	@IBAction func rewindButtonWasPressed(_ sender: UIButton) {
+        // Rewind no faster than -2.0.
+        rate = max(player.rate - 2.0, -2.0)
+	}
+	
+	@IBAction func fastForwardButtonWasPressed(_ sender: UIButton) {
+        // Fast forward no faster than 2.0.
+        rate = min(player.rate + 2.0, 2.0)
+	}
+
+    @IBAction func timeSliderDidChange(_ sender: UISlider) {
+        currentTime = Double(sender.value)
+    }
+    
+    // MARK: - KVO Observation
+
+    // Update our UI when player or `player.currentItem` changes.
+    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey: Any]?, context: UnsafeMutableRawPointer?) {
+        // Make sure the this KVO callback was intended for this view controller.
+        guard context == &playerViewControllerKVOContext else {
+            super.observeValue(forKeyPath: keyPath, of: object, change: change, context: context)
+            return
+        }
+
+        if keyPath == #keyPath(PlayerViewController.player.currentItem.duration) {
+            // Update timeSlider and enable/disable controls when duration > 0.0
+
+            /*
+                Handle `NSNull` value for `NSKeyValueChangeNewKey`, i.e. when 
+                `player.currentItem` is nil.
+            */
+            let newDuration: CMTime
+            if let newDurationAsValue = change?[NSKeyValueChangeKey.newKey] as? NSValue {
+                newDuration = newDurationAsValue.timeValue
+            }
+            else {
+                newDuration = kCMTimeZero
+            }
+
+            let hasValidDuration = newDuration.isNumeric && newDuration.value != 0
+            let newDurationSeconds = hasValidDuration ? CMTimeGetSeconds(newDuration) : 0.0
+			let currentTime = hasValidDuration ? Float(CMTimeGetSeconds(player.currentTime())) : 0.0
+
+            timeSlider.maximumValue = Float(newDurationSeconds)
+
+            timeSlider.value = currentTime
+            
+            rewindButton.isEnabled = hasValidDuration
+            
+            playPauseButton.isEnabled = hasValidDuration
+            
+            fastForwardButton.isEnabled = hasValidDuration
+            
+            timeSlider.isEnabled = hasValidDuration
+            
+            startTimeLabel.isEnabled = hasValidDuration
+            startTimeLabel.text = createTimeString(time: currentTime)
+			
+            durationLabel.isEnabled = hasValidDuration
+            durationLabel.text = createTimeString(time: Float(newDurationSeconds))
+        }
+        else if keyPath == #keyPath(PlayerViewController.player.rate) {
+            // Update `playPauseButton` image.
+
+            let newRate = (change?[NSKeyValueChangeKey.newKey] as! NSNumber).doubleValue
+            
+            let buttonImageName = newRate == 1.0 ? "PauseButton" : "PlayButton"
+            
+            let buttonImage = UIImage(named: buttonImageName)
+
+            playPauseButton.setImage(buttonImage, for: UIControlState())
+        }
+        else if keyPath == #keyPath(PlayerViewController.player.currentItem.status) {
+            // Display an error if status becomes `.Failed`.
+
+            /*
+                Handle `NSNull` value for `NSKeyValueChangeNewKey`, i.e. when
+                `player.currentItem` is nil.
+            */
+            let newStatus: AVPlayerItemStatus
+
+            if let newStatusAsNumber = change?[NSKeyValueChangeKey.newKey] as? NSNumber {
+                newStatus = AVPlayerItemStatus(rawValue: newStatusAsNumber.intValue)!
+            }
+            else {
+                newStatus = .unknown
+            }
+            
+            if newStatus == .failed {
+                handleErrorWithMessage(player.currentItem?.error?.localizedDescription, error:player.currentItem?.error)
+            }
+        }
+    }
+
+    // Trigger KVO for anyone observing our properties affected by player and player.currentItem
+    override class func keyPathsForValuesAffectingValue(forKey key: String) -> Set<String> {
+        let affectedKeyPathsMappingByKey: [String: Set<String>] = [
+            "duration":     [#keyPath(PlayerViewController.player.currentItem.duration)],
+            "rate":         [#keyPath(PlayerViewController.player.rate)]
+        ]
+        
+        return affectedKeyPathsMappingByKey[key] ?? super.keyPathsForValuesAffectingValue(forKey: key)
+	}
+
+    // MARK: - Error Handling
+
+	func handleErrorWithMessage(_ message: String?, error: Error? = nil) {
+        NSLog("Error occured with message: \(message), error: \(error).")
+    
+        let alertTitle = NSLocalizedString("alert.error.title", comment: "Alert title for errors")
+        let defaultAlertMessage = NSLocalizedString("error.default.description", comment: "Default error message when no NSError provided")
+
+        let alert = UIAlertController(title: alertTitle, message: message == nil ? defaultAlertMessage : message, preferredStyle: UIAlertControllerStyle.alert)
+
+        let alertActionTitle = NSLocalizedString("alert.error.actions.OK", comment: "OK on error alert")
+
+        let alertAction = UIAlertAction(title: alertActionTitle, style: .default, handler: nil)
+        
+        alert.addAction(alertAction)
+
+        present(alert, animated: true, completion: nil)
+	}
+	
+	// MARK: Convenience
+	
+	func createTimeString(time: Float) -> String {
+		let components = NSDateComponents()
+		components.second = Int(max(0.0, time))
+		
+		return timeRemainingFormatter.string(from: components as DateComponents)!
+	}
+}

AVFoundationSimplePlayer/Swift/AVFoundationSimplePlayer-iOS/en.lproj/Localizable.strings

@@ -0,0 +1,22 @@
+/*
+	<samplecode>
+		<abstract>
+			Localizable strings.
+		</abstract>
+	</samplecode>
+*/
+
+// Alert title for errors.
+"alert.error.title" = "Error";
+
+// OK action on error alert
+"alert.error.actions.OK" = "OK on error alert";
+
+// Can't use this AVAsset because one of it's keys failed to load.
+"error.asset_key_%@_failed.description" = "Media failed to load key \"%@\"";
+
+// Can't use this AVAsset because it isn't playable or has protected content.
+"error.asset_not_playable.description" = "Media isn't playable or has protected content";
+
+// Default error message when no NSError provided.
+"error.default.description" = "Unknown error";