Question

我已将观察者添加到AVPlayer但是当avplayer状态准备好播放时它没有调用该功能。该视频开始播放时调用两次，但AVPlayer的持续时间参数都返回＆＃39; nan＆＃39;当AVPlayer准备播放时，我需要获得持续时间。

    playerController.player = player
    self.addChildViewController(playerController)
    self.view.addSubview(playerController.view)
    playerController.view.frame = self.view.frame
    playerController.showsPlaybackControls = false
    player.addObserver(self, forKeyPath: "status", options: NSKeyValueObservingOptions(), context: nil)
    player.play()

override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>) {
    if player.currentItem?.status == AVPlayerItemStatus.ReadyToPlay {
      print("a")  
    }
}

Answer 1

替换addObserver这样的行：

player.currentItem!.addObserver(self, forKeyPath: "status", options: NSKeyValueObservingOptions(), context: nil)

当AVPlayer准备播放时，AVPlayer的addObserver永远不会被调用？

1 个答案: