AVPlayerController：全屏自动布局问题

Question

我正在使用以下代码在我的 Swift 应用程序 (iOS 9) 中播放视频：

        let fileUrl = NSBundle.mainBundle().URLForResource("welcome", withExtension: ".mp4")
        videoItem =  AVPlayerItem(URL: fileUrl!)
        videoPlayer = AVPlayer(playerItem: videoItem)
        videoPlayer.addObserver(self, forKeyPath: "rate", options: [.New], context: nil)

        videoPlayerController.player = videoPlayer
        videoPlayerController.showsPlaybackControls = false

        videoPlayerController.view.frame = CGRectMake(0, 0, playerView.frame.size.width, playerView.frame.size.height)
        playerView.insertSubview(videoPlayerController.view, belowSubview: videoCoverView)

        videoPlayerController.willMoveToParentViewController(self)
        addChildViewController(videoPlayerController)
        videoPlayerController.didMoveToParentViewController(self)

        playerView.bringSubviewToFront(btnPlay)

        let asset = AVAsset(URL: fileUrl!)
        let imageGenerator = AVAssetImageGenerator(asset: asset)
        let time = CMTime(seconds: asset.duration.seconds/2.0, preferredTimescale: 1)

        do {
            let imageRef = try imageGenerator.copyCGImageAtTime(time, actualTime: nil)
            let coverImage = UIImage(CGImage: imageRef)
            videoCoverView.image = coverImage
        } catch {

        }

videoPlayerController 是 AVPlayerViewController 的实例。 playerView 是通过故事板添加的，并在其上设置了自动版式。一旦 AVPlayerViewController 的播放器控件出现，以及当我尝试通过播放器控件进入全屏模式时，我都会遇到 Autloayout 问题。这是打印的日志。

2016-05-07 15:18:19.325 VoxTrain[2085:66307] Unable to simultaneously satisfy constraints.
    Probably at least one of the constraints in the following list is one you don't want. 
    Try this: 
        (1) look at each constraint and try to figure out which you don't expect; 
        (2) find the code that added the unwanted constraint or constraints and fix it. 
    (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
(
    "<NSAutoresizingMaskLayoutConstraint:0x7fb6a2a3f2c0 h=-&- v=-&- _UIBackdropContentView:0x7fb6a2a02310.width == _UIBackdropView:0x7fb6a053bf90.width>",
    "<NSLayoutConstraint:0x7fb6a2992800 H:|-(14)-[UILabel:0x7fb6a2991220'Hi-Speed Scrubbing']   (Names: '|':_UIBackdropContentView:0x7fb6a2a02310 )>",
    "<NSLayoutConstraint:0x7fb6a2992850 H:[UILabel:0x7fb6a2991220'Hi-Speed Scrubbing']-(14)-|   (Names: '|':_UIBackdropContentView:0x7fb6a2a02310 )>",
    "<NSLayoutConstraint:0x7fb6a29649a0 H:|-(0)-[_UIBackdropView:0x7fb6a053bf90]   (Names: '|':UIView:0x7fb6a0549220 )>",
    "<NSLayoutConstraint:0x7fb6a298b8a0 H:[_UIBackdropView:0x7fb6a053bf90]-(0)-|   (Names: '|':UIView:0x7fb6a0549220 )>",
    "<NSLayoutConstraint:0x7fb6a296f440 H:|-(0)-[UIView:0x7fb6a0549220]   (Names: '|':AVAlphaUpdatingView:0x7fb6a053dae0 )>",
    "<NSLayoutConstraint:0x7fb6a296f490 H:[UIView:0x7fb6a0549220]-(0)-|   (Names: '|':AVAlphaUpdatingView:0x7fb6a053dae0 )>",
    "<NSLayoutConstraint:0x7fb6a2a40cc0 'UIView-Encapsulated-Layout-Width' H:[AVAlphaUpdatingView:0x7fb6a053dae0(0)]>"
)

在最初的方法之后，我尝试在 videoPlayerController's 视图上设置 autolayout，并将 translatesAutoresizingMaskIntoConstraints 设置为 false。但问题仍然存在。我该如何解决这些问题？

Answer 1

使用此代码，

viewDidLoad 方法：

        let type : String! = "mp4"
        let targetURL : String? = NSBundle.mainBundle().pathForResource("Welcome", ofType: type)

        let videoURL = NSURL(fileURLWithPath:targetURL!)


        let player = AVPlayer(URL: videoURL)
        let playerController = AVPlayerViewController()

        playerController.player = player
        self.addChildViewController(playerController)
        self.playView.addSubview(playerController.view)
        playerController.view.frame = playView.bounds

        player.play()

下面是我的故事板视图，

我创建了UIView，然后设置top,left,right和Height就解决了。它对我有用

希望对您有所帮助

Answer 2

问题是当您的 AVPlayerController 在屏幕上时，您试图设置 showsPlaybackControls = true。这样做会创建系统 UI 元素，从而导致自动布局问题。

文档对这一点非常具体：

Do not use this property to change the visibility of the playback controls while the player view controller is onscreen, because doing so creates or destroys UI elements.

Link: https://developer.apple.com/library/ios/documentation/AVFoundation/Reference/AVPlayerViewController_Class/#//apple_ref/occ/instp/AVPlayerViewController/showsPlaybackControls

AVPlayerController：全屏自动布局问题

AVPlayerController: Full screen Autolayout issues

ios

swift

autolayout

avplayer