MPRemoteCommandCenter 暂停播放按钮未切换

如何使用 MPRemoteCommandCenter 控制暂停/播放按钮切换

swift
import MediaPlayer
class ViewController: UIViewController {
    // 创建音频播放器
    let audioPlayer = AVPlayer(url: URL(fileURLWithPath: "your_audio_file_path"))
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 监听播放状态改变
        audioPlayer.addObserver(self, forKeyPath: "rate", options: [.new, .old], context: nil)
        
        // 设置远程命令中心
        let remoteCommandCenter = MPRemoteCommandCenter.shared()
        
        // 监听播放/暂停按钮事件
        remoteCommandCenter.playCommand.addTarget { (_) -> MPRemoteCommandHandlerStatus in
            self.audioPlayer.play()
            return .success
        }
        
        remoteCommandCenter.pauseCommand.addTarget { (_) -> MPRemoteCommandHandlerStatus in
            self.audioPlayer.pause()
            return .success
        }
    }
    // 响应播放状态改变
    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        if keyPath == "rate" {
            let isPlaying = audioPlayer.rate != 0
            // 更新锁屏界面和控制中心的暂停/播放按钮状态
            MPNowPlayingInfoCenter.default().nowPlayingInfo?[MPNowPlayingInfoPropertyPlaybackRate] = isPlaying ? 1 : 0
        }
    }
}