如何在Swift中使用AVPlayerViewController（AVKit）播放視頻如何使用Swift中的AV Kit Player View Controller播放視頻？override func viewDidLoad() {         super.viewDidLoad()         let videoURLWithPath = "http://****/5.m3u8"         let videoURL = NSURL(string: videoURLWithPath)         playerViewController = AVPlayerViewController()         dispatch_async(dispatch_get_main_queue()) {             self.playerViewController?.player = AVPlayer.playerWithURL(videoURL) as AVPlayer         }     }