ios - 如何使用 AVPlayerLooper 循环播放视频

Question

我尝试使用 AVPlayerLooper 在 TV OS 应用程序中循环播放视频，因为这应该可以消除再次播放视频时的暂停/打嗝。我观看了 WWDC2016 视频 https://developer.apple.com/videos/play/wwdc2016/503/并尝试实现代码，但它不会循环。我有一个 PlayerViewController 继承了 AVPlayerViewController。我放了代码让视频循环播放。如果我有以下代码，它什么也不显示。如果我将第二行更改为 self.queuePlayer = AVQueuePlayer(playerItem:playerItem)，它只会播放一次。

  let playerItem = AVPlayerItem(url: url as URL)
  self.queuePlayer = AVQueuePlayer()   //I declared this as a variable in the view controller
  self.playerLayer = AVPlayerLayer(player: self.queuePlayer) //I declared this as a variable in the view controller
  let playerLooper = AVPlayerLooper(player:  self.queuePlayer!, templateItem: playerItem)
  self.view.layer.addSublayer(self.playerLayer!)
  self.playerLayer?.frame = self.view.frame
  self.queuePlayer?.play()

你们中有人成功地使用最新的 AVPlayerLooper 播放循环视频吗？

Answer 1

我自己解决了这个问题。

playerLooper 必须是类中的成员变量，否则它不起作用，因为局部变量在调用该方法后消失了。所以我把这一行放在类的开头来声明它。我没有将它声明为 AVPlayerLooper，因为这仅适用于 tvos10.0 和更新版本。我想让我的类(class)适配tvos9.0。这是我的工作代码。

var playerLooper: NSObject?
var playerLayer:AVPlayerLayer!
var queuePlayer: AVQueuePlayer?


func playVideo(_ filmName: String){
    if let path = Bundle.main.path(forResource: filmName, ofType: "mov") {
        let url =  URL(fileURLWithPath: path)

        if #available(tvOS 10.0, *) {

            // Use a new player looper with the queue player and template item
            let playerItem = AVPlayerItem(url: url as URL)
            self.player = AVQueuePlayer(items: [playerItem])
            self.playerLayer = AVPlayerLayer(player: self.player)
            self.playerLooper = AVPlayerLooper(player: self.player! as! AVQueuePlayer, templateItem: playerItem)
            self.view.layer.addSublayer(self.playerLayer!)
            self.playerLayer?.frame = self.view.frame
            self.player?.play()


        } else {
            // Fallback on earlier versions, this solution has hicup at end
            player = AVPlayer(url: url)
            player?.play()
            loopVideo(player!)
        }

    }
}

func loopVideo(_ videoPlayer: AVPlayer) {
    NotificationCenter.default.addObserver(forName: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: nil, queue: nil) { notification in
        if(!self.isStopped){

            videoPlayer.seek(to: kCMTimeZero)
            videoPlayer.play()

        }
    }
}