AVPlayer缓冲后停止播放视频

从 iOS 10.x开始 ，您可以进行一些缓冲设置，例如，您可以决定缓冲视频需要多少秒：

    if #available(iOS 10.0, tvOS 10.0, OSX 10.12, *) {        avPlayer?.automaticallyWaitsToMinimizeStalling = .playWhenBufferNotEmpty        //preferredForwardBufferDuration -> default is 0, which means `AVPlayer` handle it independently, try more seconds like 5 or 10.        playerItem.preferredForwardBufferDuration = TimeInterval(5)     }