使用Swift禁用MPMoviePlayerController的音频(和中断)

发布时间：2020-12-14 04:40:54 所属栏目：百科来源：网络整理

导读：目前,这就是我在UIViewController的子视图中播放视频的方式： override func viewDidAppear(animated: Bool) { let filePath = NSBundle.mainBundle().pathForResource("musicvideo",ofType: "mp4") self.moviePlayerController.contentURL = NSURL.fileURLW

目前,这就是我在UIViewController的子视图中播放视频的方式：

override func viewDidAppear(animated: Bool)  {
    let filePath = NSBundle.mainBundle().pathForResource("musicvideo",ofType: "mp4")
    self.moviePlayerController.contentURL = NSURL.fileURLWithPath(filePath)
    self.moviePlayerController.play()
    self.moviePlayerController.repeatMode = .One
    self.moviePlayerController.view.frame = self.view.bounds
    self.moviePlayerController.scalingMode = .AspectFill
    self.moviePlayerController.controlStyle = .None
    self.moviePlayerController.allowsAirPlay = false
    self.view.addSubview(self.moviePlayerController.view)
}

我已经通过以下方式阅读了关于禁用音频的方法(根本没有工作).请记住,我正在尝试禁用它,以便不通过音乐应用程序,Spotify等中断当前播放的音乐.

// Playing media items with the applicationMusicPlayer will restore the user's Music state after the application quits.

// The current volume of playing music,in the range of 0.0 to 1.0.
// This property is deprecated -- use MPVolumeView for volume control instead.

1)MPMusicPlayerController.applicationMusicPlayer().volume = 0

2)MPVolumeView甚至没有设置实际音量的设置？这是一个控制.

3)self.movi??ePlayerController.useApplicationAudioSession = false

解决方法

所以我找到了 this answer.

这是我最终使用的Swift代码.然后我使用AVPlayerLayer作为子图层添加到视图中,它完美地工作.

感谢OP成功获得Apple技术人员并提供原始Objective-C code.

我现在面临的唯一问题是它：

1)中断当前音乐播放,无论是来自Music,Spotify等.

2)如果我关闭应用程序并再次打开它,视频将停止播放.

override func viewDidAppear(animated: Bool)  {
    let filePath = NSBundle.mainBundle().pathForResource("musicvideo",ofType: "mp4")

    var asset: AVURLAsset?
    asset = AVURLAsset.URLAssetWithURL(NSURL.fileURLWithPath(filePath),options: nil)
    var audioTracks = NSArray()
    audioTracks = asset!.tracksWithMediaType(AVMediaTypeAudio)

    // Mute all the audio tracks
    let allAudioParams = NSMutableArray()
    for track: AnyObject in audioTracks {
        // AVAssetTrack
        let audioInputParams = AVMutableAudioMixInputParameters()
        audioInputParams.setVolume(0.0,atTime: kCMTimeZero)
        audioInputParams.trackID = track.trackID
        allAudioParams.addObject(audioInputParams)
    }

    let audioZeroMix = AVMutableAudioMix()
    audioZeroMix.inputParameters = allAudioParams

    // Create a player item
    let playerItem = AVPlayerItem(asset: asset)
    playerItem.audioMix = audioZeroMix

    // Create a new Player,and set the player to use the player item
    // with the muted audio mix
    let player = AVPlayer.playerWithPlayerItem(playerItem) as AVPlayer

    player.play()

    let layer = AVPlayerLayer(player: player)
    player.actionAtItemEnd = .None

    layer.frame = self.view.bounds
    layer.videoGravity = AVLayerVideoGravityResizeAspectFill
    self.view.layer.addSublayer(layer)
}

（编辑：李大同）

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