iOS:外部显示器AVPlayerController关闭问题

import AVKit

class ViewController: UIViewController {
    var playerController: AVPlayerViewController?

    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建AVPlayer实例
        let player = AVPlayer(url: URL(string: "https://example.com/video.mp4")!)
        
        // 创建AVPlayerViewController实例
        playerController = AVPlayerViewController()
        playerController?.player = player
        
        // 监听外部显示器连接状态的变化
        NotificationCenter.default.addObserver(self, selector: #selector(handleScreenConnectNotification(_:)), name: UIScreen.didConnectNotification, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(handleScreenDisconnectNotification(_:)), name: UIScreen.didDisconnectNotification, object: nil)
    }
    
    @objc func handleScreenConnectNotification(_ notification: Notification) {
        // 外部显示器连接时，将视频内容显示在外部显示器上
        playerController?.externalPlaybackActive = true
    }
    
    @objc func handleScreenDisconnectNotification(_ notification: Notification) {
        // 外部显示器关闭时，将视频内容切换回设备屏幕上
        playerController?.externalPlaybackActive = false
    }
    
    // 其他代码...
}