我正在开发音乐应用程序,但对于锁定屏幕控制,我无法分配持续时间和已用时间 这是我的代码 let commandCenter = MPRemoteCommandCenter.shared() commandCenter.previousTrackCommand.isEnabled = true; commandCente
这是我的代码
let commandCenter = MPRemoteCommandCenter.shared() commandCenter.previousTrackCommand.isEnabled = true; commandCenter.previousTrackCommand.addTarget(self, action:#selector(home_ViewController.btn_rewind(_:))) commandCenter.nextTrackCommand.isEnabled = true commandCenter.nextTrackCommand.addTarget(self, action:#selector(home_ViewController.btn_fast(_:))) commandCenter.playCommand.isEnabled = true commandCenter.playCommand.addTarget(self, action:#selector(home_ViewController.play_player)) commandCenter.pauseCommand.isEnabled = true commandCenter.pauseCommand.addTarget(self, action:#selector(home_ViewController.pause_player)) commandCenter.togglePlayPauseCommand.isEnabled = true commandCenter.togglePlayPauseCommand.addTarget(self, action:#selector(home_ViewController.togglePlay_Pause)) commandCenter.skipBackwardCommand.isEnabled = false commandCenter.skipForwardCommand.isEnabled = false if #available(iOS 9.1, *) { commandCenter.changePlaybackPositionCommand.isEnabled = true } else { // Fallback on earlier versions return }
和媒体信息
func setLockInfo() { let url = URL(string: song_UrlString) let data = try? Data(contentsOf: url!) let art = MPMediaItemArtwork.init(image: UIImage(data: data!)!) let songInfo :[String : Any] = [MPMediaItemPropertyTitle :st_title,MPMediaItemPropertyArtwork : art] MPNowPlayingInfoCenter.default().nowPlayingInfo = songInfo }
我正在获得标题和图像,但锁定屏幕没有显示时间
我正在使用SWIFT 3进行编码
它没有显示时间,因为你没有告诉它显示时间.要显示播放时间,nowPlayingInfo字典需要包含键的值:
> MPNowPlayingInfoPropertyElapsedPlaybackTime
,所以它知道你开始玩的时候是什么时候,
> MPMediaItemPropertyPlaybackDuration
,所以它知道当前时间相对于酒吧是什么,并且
> MPNowPlayingInfoPropertyPlaybackRate
,因此它可以自动更新播放时间UI,而无需您定期设置当前时间.
如果您希望播放时间栏是交互式的(即允许跳转到不同的时间而不是仅显示当前时间,请在远程命令中心注册changePlaybackPositionCommand
.