[FIX] Metatada object type support validation

Example/QRCodeReader.swift/ViewController.swift

@@ -31,7 +31,7 @@ class ViewController: UIViewController, QRCodeReaderViewControllerDelegate {
     lazy var reader = QRCodeReaderViewController(metadataObjectTypes: [AVMetadataObjectTypeQRCode])
     
     @IBAction func scanAction(sender: AnyObject) {
-      if QRCodeReader.isAvailable() && QRCodeReader.supportsMetadataObjectTypes() {
+      if QRCodeReader.supportsMetadataObjectTypes() {
         reader.modalPresentationStyle = .FormSheet
         reader.delegate               = self
         

QRCodeReader.swift.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = 'QRCodeReader.swift'
-  s.version          = '3.1.1'
+  s.version          = '3.1.2'
   s.license          = 'MIT'
   s.summary          = 'Simple QRCode and 1D bar code reader in Swift'
   s.homepage         = 'https://github.com/yannickl/QRCodeReader.swift.git'

QRCodeReader/QRCodeReader.swift

@@ -55,8 +55,8 @@ public final class QRCodeReader: NSObject, AVCaptureMetadataOutputObjectsDelegat
     
     return nil
     }()
-  private var metadataOutput: AVCaptureMetadataOutput       = AVCaptureMetadataOutput()
-  private var session: AVCaptureSession                     = AVCaptureSession()
+  private var metadataOutput = AVCaptureMetadataOutput()
+  private var session        = AVCaptureSession()
   
     /// CALayer that you use to display video as it is being captured by an input device.
   public lazy var previewLayer: AVCaptureVideoPreviewLayer = { return AVCaptureVideoPreviewLayer(session: self.session) }()
@@ -166,7 +166,18 @@ public final class QRCodeReader: NSObject, AVCaptureMetadataOutputObjectsDelegat
   
   /// Checks and return whether the given metadata object types are supported by the current device
   class func supportsMetadataObjectTypes(_ metadataTypes: [String]? = nil) -> Bool {
-    let output = AVCaptureMetadataOutput()
+    if !isAvailable() {
+      return false
+    }
+
+    // Setup components
+    let captureDevice = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo) as AVCaptureDevice
+    let deviceInput   = AVCaptureDeviceInput.deviceInputWithDevice(captureDevice, error: nil) as AVCaptureDeviceInput
+    let output        = AVCaptureMetadataOutput()
+    let session       = AVCaptureSession()
+    
+    session.addInput(deviceInput)
+    session.addOutput(output)
     
     var metadataObjectTypes = metadataTypes
     

README.md

@@ -26,7 +26,7 @@ $ touch Podfile
 $ edit Podfile
 source 'https://github.com/CocoaPods/Specs.git'
 platform :ios, '8.0'
-pod 'QRCodeReader.swift', '~> 3.1.1'
+pod 'QRCodeReader.swift', '~> 3.1.2'
 ```
 
 Install into your project:
@@ -84,7 +84,7 @@ func readerDidCancel(reader: QRCodeReader) {
 }
 ```
 
-*Note that you should check whether the device supports the reader library by using the `QRCodeReader.isAvailable()` and the `QRCodeReader.supportsMetadataObjectTypes()` methods.*
+*Note that you should check whether the device supports the reader library by using the `QRCodeReader.isAvailable()` or the `QRCodeReader.supportsMetadataObjectTypes()` methods.*
 
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