Question

我有MusicPlayer视图控制器，你可以播放一些本地的mp3文件。我需要启用remoteControlReceived我的应用程序才能在应用程序之外更改音乐（播放/暂停，下一个）。我的问题是切换按钮仅在应用程序位于MusicPlayerViewController时才有效。例如，如果这个vc解散或进入后台，那么这些操作将不再起作用！。首先，我在MusicPlayerViewController中设置了这些通知：

  override func viewDidLoad() {
        super.viewDidLoad()

        //Control Music

        NotificationCenter.default.addObserver(self, selector: #selector(playSong), name: NSNotification.Name("playSong"), object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(nextSong), name: NSNotification.Name("nextSong"), object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(previousSong), name: NSNotification.Name("previousSong"), object: nil)

}

然后在AppDelegate：

  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {


  //Play music when it's on BG
        do {
            try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback)
            print("AVAudioSession Category Playback OK")
            do {
                try AVAudioSession.sharedInstance().setActive(true)
                print("AVAudioSession is Active")
            } catch let error as NSError {
                print(error.localizedDescription)
            }
        } catch let error as NSError {
            print(error.localizedDescription)
        }

        UIApplication.shared.beginReceivingRemoteControlEvents()

}



 override func remoteControlReceived(with event: UIEvent?) {
        if event!.type == UIEventType.remoteControl{
            switch event!.subtype{
            case UIEventSubtype.remoteControlPlay:
                NotificationCenter.default.post(name: NSNotification.Name("playSong"), object: nil)

            case UIEventSubtype.remoteControlPause:
                NotificationCenter.default.post(name: NSNotification.Name("playSong"), object: nil)

            case UIEventSubtype.remoteControlNextTrack:
                NotificationCenter.default.post(name: NSNotification.Name("nextSong"), object: nil)

            case UIEventSubtype.remoteControlPreviousTrack:
                NotificationCenter.default.post(name: NSNotification.Name("previousSong"), object: nil)

            default:
                print("There is an issue with the control")
            }
        }
    }

我无法从任何地方控制AVPlayer的问题是什么！

PS：我还在AppDelegate中设置播放音乐

Answer 1

您需要在AVAudioPlayer上应用类别。因此，您需要在分配AVAudioPlayer之后编写下面的代码。

//分配您的音频播放器＆amp;然后

希望这会对你有所帮助。

使用remoteControlReceived控制音乐时遇到问题

1 个答案: