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Update ios example

This commit is contained in:
Simon 2018-12-28 17:34:50 +08:00
parent 2ce0b6f3bf
commit 1dc476e7f5
4 changed files with 115 additions and 2 deletions
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4
Examples/ImagesExample/ImagesExample.xcodeproj/project.pbxproj
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@ -7,6 +7,7 @@
objects = {
/* Begin PBXBuildFile section */
F4A9D56421D5FE6300A6E2DE /* PhotosLibrary.swift in Sources */ = {isa = PBXBuildFile; fileRef = F4A9D56321D5FE6300A6E2DE /* PhotosLibrary.swift */; };
F4EC51C421D33B6900DED569 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = F4EC51C321D33B6900DED569 /* AppDelegate.swift */; };
F4EC51C621D33B6900DED569 /* ViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = F4EC51C521D33B6900DED569 /* ViewController.swift */; };
F4EC51CB21D33B6B00DED569 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = F4EC51CA21D33B6B00DED569 /* Assets.xcassets */; };
@ -61,6 +62,7 @@
/* End PBXCopyFilesBuildPhase section */
/* Begin PBXFileReference section */
F4A9D56321D5FE6300A6E2DE /* PhotosLibrary.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PhotosLibrary.swift; sourceTree = "<group>"; };
F4EC51C021D33B6900DED569 /* ImagesExample.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = ImagesExample.app; sourceTree = BUILT_PRODUCTS_DIR; };
F4EC51C321D33B6900DED569 /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
F4EC51C521D33B6900DED569 /* ViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ViewController.swift; sourceTree = "<group>"; };
@ -119,6 +121,7 @@
F4EC51CA21D33B6B00DED569 /* Assets.xcassets */,
F4EC51CC21D33B6B00DED569 /* LaunchScreen.storyboard */,
F4EC51CF21D33B6B00DED569 /* Info.plist */,
F4A9D56321D5FE6300A6E2DE /* PhotosLibrary.swift */,
);
path = ImagesExample;
sourceTree = "<group>";
@ -274,6 +277,7 @@
buildActionMask = 2147483647;
files = (
F4EC51C621D33B6900DED569 /* ViewController.swift in Sources */,
F4A9D56421D5FE6300A6E2DE /* PhotosLibrary.swift in Sources */,
F4EC51C421D33B6900DED569 /* AppDelegate.swift in Sources */,
);
runOnlyForDeploymentPostprocessing = 0;

2
Examples/ImagesExample/ImagesExample/Info.plist
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@ -20,6 +20,8 @@
<string>1</string>
<key>LSRequiresIPhoneOS</key>
<true/>
<key>NSPhotoLibraryUsageDescription</key>
<string>Add or remove placeholder images into your camera roll</string>
<key>UILaunchStoryboardName</key>
<string>LaunchScreen</string>
<key>UIRequiredDeviceCapabilities</key>

91
Examples/ImagesExample/ImagesExample/PhotosLibrary.swift Normal file
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@ -0,0 +1,91 @@
//
// PhotosLibrary.swift
// ImagesExample
//
// Created by Simon Lee on 12/28/18.
// Copyright © 2018 Shao Ping Lee. All rights reserved.
//
import Foundation
import Photos
class PhotosLibrary {
enum Error: Swift.Error {
case AlbumDNE
}
static let albumName = "PlaceholderKit"
func addImages(_ images: [UIImage]) throws {
for image in images {
try addImage(image)
}
}
// Add image to thelibrary
func addImage(_ image: UIImage,
toAlbumNamed title: String = albumName) throws {
guard let album = fetchAlbum(title: title).firstObject else {
throw Error.AlbumDNE
}
let assetChangeRequest = PHAssetChangeRequest.creationRequestForAsset(from: image)
let assetPlaceHolder = assetChangeRequest.placeholderForCreatedAsset
let albumChangeRequest = PHAssetCollectionChangeRequest(for: album)
let enumeration = [assetPlaceHolder].compactMap({$0}) as NSArray
albumChangeRequest?.addAssets(enumeration)
}
func fetchAlbum(title: String) -> PHFetchResult<PHAssetCollection> {
// Fetch albums with title
let options = PHFetchOptions()
options.predicate = NSPredicate(format: "title = %@", title)
let album = PHAssetCollection.fetchAssetCollections(with: .album, subtype: .any, options: options)
return album
}
func performChanges(_ changeBlock: @escaping (PhotosLibrary) -> Void,
completionHandler: ((Bool, Swift.Error?) -> Void)? = nil) {
ensurePhotoLibaryAuthorized { (library) in
PHPhotoLibrary.shared().performChanges({
changeBlock(library)
}, completionHandler: completionHandler)
}
}
func ensurePhotoLibaryAuthorized(authorizedHandler: @escaping (PhotosLibrary) -> Void) {
if PHPhotoLibrary.authorizationStatus() == .authorized {
authorizedHandler(self)
return
}
PHPhotoLibrary.requestAuthorization { _ in
authorizedHandler(self)
}
}
// Create an album for placeholders
func createAlbum(title: String = albumName) {
// Make sure album doesn't exist already
let album = fetchAlbum(title: title)
guard album.count == 0 else {
return
}
// Create a new album with the entered title.
PHAssetCollectionChangeRequest.creationRequestForAssetCollection(withTitle: title)
}
// Remove the album the has the placeholders
func removeAlbum(title: String = albumName) {
let album = fetchAlbum(title: title)
// Delete
album.enumerateObjects { (collection, _, _) in
let assets = PHAsset.fetchAssets(in: collection, options: nil)
PHAssetChangeRequest.deleteAssets(assets)
PHAssetCollectionChangeRequest(for: collection)?.removeAssets(assets)
}
}
}

20
Examples/ImagesExample/ImagesExample/ViewController.swift
View File

@ -8,16 +8,19 @@
import UIKit
import PlaceholderKit
import Photos
class ViewController: UIViewController {
var sampleImagesCollectionViewController: SampleImagesCollectionViewController?
let images: [UIImage] = PlaceholderKit.defaultPlaceholders
let photosLibary = PhotosLibrary()
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor(red: 0.3, green: 0.3, blue: 0.3, alpha: 1.0)
setupCollectionViewController()
}
func setupCollectionViewController() {
@ -29,12 +32,25 @@ class ViewController: UIViewController {
sampleImagesCollectionViewController = controller
NSLayoutConstraint.activate([
collectionView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor, constant: 30),
collectionView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor, constant: -30),
collectionView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor),
collectionView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor),
collectionView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: -30),
collectionView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 30)
])
}
func insertImagesIntoPhotos(completionHandler: ((Bool, Error?) -> Void)? = nil) {
photosLibary.performChanges({ library in
library.createAlbum()
try? library.addImages(self.images)
}, completionHandler: completionHandler)
}
func removeAlbum(completionHandler: ((Bool, Error?) -> Void)? = nil) {
photosLibary.performChanges({ library in
library.removeAlbum()
}, completionHandler: completionHandler)
}
}
class SampleImagesCollectionViewController: UICollectionViewController {