MPRemoteCommandCenter锁屏远程控制不显示及音频中断功能失效问题

问题修复步骤 #

• 确认后台模式配置正确：在项目的Signing & Capabilities中添加Background Modes能力，勾选Audio, AirPlay, and Picture in Picture，需和系统权限设置同时生效。

1. 修正AVAudioSession配置错误
   你两次设置AVAudioSession的Category，第一次设置的.mixWithOthers选项会让系统优先展示其他音频App的锁屏控制，直接删除重复设置和错误选项：

// 替换buttonPressed中的音频会话配置代码
do {
    try AVAudioSession.sharedInstance().setCategory(.playback, mode: .default, options: [.allowAirPlay])
    print("Playback OK")
    try AVAudioSession.sharedInstance().setActive(true)
    print("Session is Active")
} catch {
    print(error)
}

2. 修正Remote Command处理逻辑错误
   你当前play和pause命令的判断条件写反了，修改对应判断逻辑：

func setupRemoteTransportControls() {
    let commandCenter = MPRemoteCommandCenter.shared()
    commandCenter.playCommand.addTarget { [unowned self] event in
        if self.player.rate == 0 { // 暂停状态才执行播放逻辑
            self.player.play()
            self.updateNowPlaying(isPause: false)
            return .success
        }
        return .commandFailed
    }
    commandCenter.pauseCommand.addTarget { [unowned self] event in
        if self.player.rate == 1.0 { // 播放状态才执行暂停逻辑
            self.player.pause()
            self.updateNowPlaying(isPause: true)
            return .success
        }
        return .commandFailed
    }
}

3. 调整NowPlayingInfo设置时机
   不要在viewDidLoad阶段调用setupNowPlaying()，改成在AVPlayer调用play()之后再调用，确保播放状态激活后再向系统上报元数据。
4. 补全NowPlayingInfo必填字段，恢复注释代码
   你注释掉了播放时间和速率的设置，这两个字段是系统判断播放状态的核心参数，必须设置：

func setupNowPlaying(title: String, artist: String, cover: UIImage) {
    var nowPlayingInfo = [String : Any]()
    nowPlayingInfo[MPMediaItemPropertyTitle] = title
    nowPlayingInfo[MPMediaItemPropertyArtist] = artist
    nowPlayingInfo[MPMediaItemPropertyArtwork] = MPMediaItemArtwork(boundsSize: cover.size) { size in
        return cover
    }
    nowPlayingInfo[MPNowPlayingInfoPropertyIsLiveStream] = true
    nowPlayingInfo[MPNowPlayingInfoPropertyPlaybackRate] = 1.0
    nowPlayingInfo[MPNowPlayingInfoPropertyElapsedPlaybackTime] = player.currentTime().seconds
    MPNowPlayingInfoCenter.default().nowPlayingInfo = nowPlayingInfo
}

func updateNowPlaying(isPause: Bool) {
    guard var nowPlayingInfo = MPNowPlayingInfoCenter.default().nowPlayingInfo else { return }
    nowPlayingInfo[MPNowPlayingInfoPropertyElapsedPlaybackTime] = player.currentTime().seconds
    nowPlayingInfo[MPNowPlayingInfoPropertyPlaybackRate] = isPause ? 0 : 1
    MPNowPlayingInfoCenter.default().nowPlayingInfo = nowPlayingInfo
}

5. 注册音频中断通知
   你只实现了handleInterruption方法，没有添加通知监听，在viewDidLoad里添加注册代码：

NotificationCenter.default.addObserver(self, selector: #selector(handleInterruption(notification:)), name: AVAudioSession.interruptionNotification, object: nil)

6. 确保AVPlayer被全局持有
   检查你的player变量是否声明为ViewController的成员属性，不要在buttonPressed里声明为局部变量，否则会被ARC自动释放，导致播放停止、控制失效。

内容的提问来源于stack exchange，提问作者LewTrocki