1、在AppDelegate中设置sceneSessionDidDisconnect方法以处理UIScene名称和对象的字典。在AVPlayerViewController中，找到AVPlayerViewControllerDelegate protocol，并将以下方法添加到AVPlayerViewController子类中：

func playerViewController(_ playerViewController: AVPlayerViewController, willTransitionToVisibilityOfTransportBar visible: Bool, with coordinator: UIViewControllerTransitionCoordinator) { if visible { AVPlayerViewController.activeAirplayVideoSceneSession = playerViewController.contentViewController?.view.window?.windowScene?.session } }

2、在AVPlayerViewControllerDelegate protocol中添加一个静态变量以存储当前连接的Airplay会话：

static var activeAirplayVideoSceneSession: UISceneSession?

3、在AVPlayerViewController中，找到为AVPlayerViewController子类设置视频的方法，并附加以下代码：

if let airplayVideoSceneSession = AVPlayerViewController.activeAirplayVideoSceneSession { playerViewController.contentViewController?.view.window?.windowScene?.detach(session: airplayVideoSceneSession) }

4、最后，添加以下代码到AppDelegate中的应用程序DidEnterBackground方法：

if let airplayVideoSceneSession = AVPlayerViewController.activeAirplayVideoSceneSession { UIApplication.shared.requestSceneSessionDestruction(airplayVideoSceneSession, options: nil, errorHandler: nil) AVPlayerViewController.activeAirplayVideoSceneSession = nil }

这样，当用户开始Airplay会话时，脱离领先的UIScene，将现有的AVPlayerViewController对象与新的外部显卡窗口重新附加连。