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我正在尝试从远程命令中心接收关于何时点击播放/暂停按钮的通知，以便我可以适当地更新播放/暂停按钮的图像。但是，我没有收到有关何时按下播放命令/暂停命令的通知（即何时应该打印“轻按播放”或“轻按暂停”）。这是我第一次使用这个库，所以我跟着 Apples 文档，它说要使用 applicationMusicPlayer 或 applicationQueuePlayer 来实现一个音乐控制器来接收这些事件，但到目前为止我还不能。我不知道除了将其设置为 applicationQueuePlayer 之外是否还有其他需要做的事情。

这是我的代码，用于产生这种情况的非常简单的音乐播放器控制器：

let musicPlayer = MPMusicPlayerController.applicationQueuePlayer

override func viewDidLoad() {
   super.viewDidLoad()
   setupRemoteControl()
   musicPlayer.setQueue(with: .songs())
}

func setupRemoteControl() {
   UIApplication.shared.beginReceivingRemoteControlEvents()
        
   let commandCenter = MPRemoteCommandCenter.shared()
        
   commandCenter.playCommand.isEnabled = true
   commandCenter.playCommand.addTarget { (_) -> MPRemoteCommandHandlerStatus in
      print("tapped play")
      return .success
   }
   
   commandCenter.pauseCommand.isEnabled = true
   commandCenter.pauseCommand.addTarget {(_) -> MPRemoteCommandHandlerStatus in
      print("tapped pause")
      return .success
}

@IBAction func selectSongs(_ sender: UIButton) {
   let controller = MPMediaPickerController(mediaTypes: .music)
   controller.allowsPickingMultipleItems = true
   controller.popoverPresentationController?.sourceView = sender
   controller.delegate = self
   present(controller, animated: true, completion: nil)
}
    
    
func mediaPicker(_ mediaPicker: MPMediaPickerController, didPickMediaItems mediaItemCollection: MPMediaItemCollection) {
   musicPlayer.setQueue(with: mediaItemCollection)
   mediaPicker.dismiss(animated: true, completion: nil)
   musicPlayer.play()
}
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