Swift：命令中心不工作，即使我明确设置按钮启用？

Question

好的，这里的 Apple 命令中心有一些问题，正在播放后台 audio/on 锁屏，不明白为什么。看起来很简单，但我什至没有在命令中心可靠地显示剧集信息，绝对不能 play/pause。

首先我开始音频会话：

  do {
                try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback, with: .mixWithOthers)
                print("Playback OK")
                try AVAudioSession.sharedInstance().setActive(true)
                print("Session is Active")
            } catch {
                print(error)
            }

然后我将我的命令中心按钮设置为显式启用：

UIApplication.shared.beginReceivingRemoteControlEvents()
        let commandCenter = MPRemoteCommandCenter.shared()


        commandCenter.skipForwardCommand.isEnabled = true
        commandCenter.skipBackwardCommand.isEnabled = true
        commandCenter.nextTrackCommand.isEnabled = true

        commandCenter.togglePlayPauseCommand.isEnabled = true
//        commandCenter.previousTrackCommand.isEnabled = true
//        commandCenter.togglePlayPauseCommand.isEnabled = true

        commandCenter.togglePlayPauseCommand.addTarget(self, action:#selector(togglePlayPause))
//        commandCenter.nextTrackCommand.addTarget(self, action:#selector(nextTrackForward))
//        commandCenter.previousTrackCommand.addTarget(self, action:#selector(nextTrackBack))

        commandCenter.skipForwardCommand.addTarget(self, action:#selector(ffPressed))
        commandCenter.skipBackwardCommand.addTarget(self, action:#selector(rwPressed))

如果这对音频很重要，这里是 lldb plist 键：

这是怎么回事？

Answer 1

也许你的问题很老，但有人可能也需要这个，所以我就是这样做的：

Swift 5

let player = AVPlayer()

func commandCenter () {
    let commandCenter = MPRemoteCommandCenter.shared()
    commandCenter.playCommand.addTarget         { (commandEvent) -> MPRemoteCommandHandlerStatus in  self.play();   return .success }
    commandCenter.pauseCommand.addTarget        { (commandEvent) -> MPRemoteCommandHandlerStatus in  self.pause();  return .success }
}

func pause () {
    player.pause ()
    print("paused")
}

func play () {
    player.play()
    print("play")
}

您无需启用 commandCenter.playCommand 即可 true

Swift：命令中心不工作，即使我明确设置按钮启用？

Swift: command center not working, even though I explicitly set buttons to enable?

audio

swift3

avaudiosession

mpremotecommandcenter