Swift -当AVPlayer在后台模式中被覆盖时，我如何发送通知？

import AVFoundation

func setupRemoteTransportControls() {
    let commandCenter = MPRemoteCommandCenter.shared()
    
    commandCenter.playCommand.addTarget { event in
        // 处理播放事件
        return .success
    }
    
    commandCenter.pauseCommand.addTarget { event in
        // 处理暂停事件
        return .success
    }
    
    // 添加其他需要处理的远程控制事件
    
    // 注册后台通知
    do {
        try AVAudioSession.sharedInstance().setCategory(.playback, mode: .default, options: [])
        try AVAudioSession.sharedInstance().setActive(true)
    } catch {
        print("Failed to set audio session category.")
    }
}

import AVFoundation

class PlayerViewController: UIViewController {
    var player: AVPlayer!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 初始化AVPlayer
        
        // 监听AVPlayer被覆盖的通知
        NotificationCenter.default.addObserver(self, selector: #selector(playerDidBecomeInterrupted), name: AVAudioSession.interruptionNotification, object: nil)
    }
    
    @objc func playerDidBecomeInterrupted(notification: Notification) {
        if let userInfo = notification.userInfo,
           let typeValue = userInfo[AVAudioSessionInterruptionTypeKey] as? UInt,
           let type = AVAudioSession.InterruptionType(rawValue: typeValue) {
            if type == .began {
                // AVPlayer被覆盖，发送通知
                NotificationCenter.default.post(name: Notification.Name("PlayerInterruptedNotification"), object: nil)
            }
        }
    }
}

class MainViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 监听AVPlayer被覆盖的通知
        NotificationCenter.default.addObserver(self, selector: #selector(playerInterrupted), name: Notification.Name("PlayerInterruptedNotification"), object: nil)
    }
    
    @objc func playerInterrupted(notification: Notification) {
        // 处理AVPlayer被覆盖的情况
    }
}