Come posso rilevare e applicare l'orientamento orizzontale a AVCaptureVideoPreviewLayer in Swift?

Question

Fondamentalmente dopo la risposta a questa domanda AVCaptureVideoPreviewLayer orientation - need landscape tranne in Swift.

Sono destinato a iOS 8 e AVCaptureVideoPreviewLayer non sembra avere una funzione setVideoOrientation.

Come dovrei rilevare che l'orientamento è cambiato e ruotare AVCaptureVideoPreviewLayer in modo appropriato?

Answer 1

Rilevare e applicare a viewWillLayoutSubviews.

Ecco come:

override func viewWillLayoutSubviews() { 

    let orientation: UIDeviceOrientation = UIDevice.currentDevice().orientation 
    print(orientation) 

    switch (orientation) { 
    case .Portrait: 
     previewLayer?.connection.videoOrientation = .Portrait 
    case .LandscapeRight: 
     previewLayer?.connection.videoOrientation = .LandscapeLeft 
    case .LandscapeLeft: 
     previewLayer?.connection.videoOrientation = .LandscapeRight 
    default: 
     previewLayer?.connection.videoOrientation = .Portrait 
    } 
} 

Answer 2

aggiornamento per Swift 3

override func viewWillLayoutSubviews() { 

    let orientation: UIDeviceOrientation = UIDevice.current.orientation 
    print(orientation) 

    switch (orientation) { 
    case .portrait: 
     videoPreviewLayer?.connection.videoOrientation = .portrait 
    case .landscapeRight: 
     videoPreviewLayer?.connection.videoOrientation = .landscapeLeft 
    case .landscapeLeft: 
     videoPreviewLayer?.connection.videoOrientation = .landscapeRight 
    case .portraitUpsideDown: 
      videoPreviewLayer?.connection.videoOrientation = .portraitUpsideDown 
    default: 
     videoPreviewLayer?.connection.videoOrientation = .portraitUpsideDown 
    } 
}