Manage music on the iPhone lock screen

Question

I am developing a music application, but to control the screen lock, I can not assign the length of time and elapsed time.

here is my code

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 } 

and media information

 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 } 

I get the title and image, but the lock screen does not display the time

I am using SWIFT 3 for code

Answer 1

He does not display time, because you do not show him time.

To show playback time, your nowPlayingInfo dictionary should include values ​​for keys:

• MPNowPlayingInfoPropertyElapsedPlaybackTime so that he knows what the current time is when you start playing,
• MPMediaItemPropertyPlaybackDuration , so that he knows that the current time is relative in the bar, and
• MPNowPlayingInfoPropertyPlaybackRate , so it can automatically update the playback user interface without having to periodically set the current time.

If you want the playtime bar to be interactive (i.e. allow switching to another time instead of just displaying the current time, register changePlaybackPositionCommand at the remote command center.

Answer 2

Swift 3 example with all woking commands, including changePlaybackPositionCommand :

 func remotePlayerInit() { UIApplication.shared.beginReceivingRemoteControlEvents() let commandCenter = MPRemoteCommandCenter.shared() commandCenter.pauseCommand.addTarget(self, action: #selector(self.pauseSongTouch(_:))) commandCenter.playCommand.addTarget(self, action: #selector(self.playSongTouch(_:))) commandCenter.nextTrackCommand.addTarget(self, action: #selector(self.nextSongTouch(_:))) commandCenter.previousTrackCommand.addTarget(self, action: #selector(self.previousSongTouch(_:))) commandCenter.changePlaybackPositionCommand.addTarget(self, action: #selector(self.changedThumbSlider(_:))) setLockInfo() } func changedThumbSlider(_ event: MPChangePlaybackPositionCommandEvent) -> MPRemoteCommandHandlerStatus { audioPlayer.currentTime = event.positionTime setLockInfo() return .success } func setLockInfo() { let image = PlayerVC.songs[PlayerVC.currentSelection].image let artwork = MPMediaItemArtwork.init(boundsSize: image.size, requestHandler: { (size) -> UIImage in return image }) let songInfo : [String : Any] = [MPMediaItemPropertyTitle : PlayerVC.songs[PlayerVC.currentSelection].name, MPMediaItemPropertyArtwork : artwork, MPNowPlayingInfoPropertyElapsedPlaybackTime : TimeInterval(audioPlayer.currentTime), MPNowPlayingInfoPropertyPlaybackRate : 1, MPMediaItemPropertyPlaybackDuration : audioPlayer.duration, MPMediaItemPropertyArtist : "Artist"] MPNowPlayingInfoCenter.default().nowPlayingInfo = songInfo } = [MPMediaItemPropertyTitle: PlayerVC.songs [PlayerVC.currentSelection] .name, MPMediaItemPropertyArtwork: artwork, MPNowPlayingInfoPropertyElapsedPlaybackTime: TimeInterval (audioPlayer.currentTime), MPNowPlayingInfoPropertyPlaybackRate: func remotePlayerInit() { UIApplication.shared.beginReceivingRemoteControlEvents() let commandCenter = MPRemoteCommandCenter.shared() commandCenter.pauseCommand.addTarget(self, action: #selector(self.pauseSongTouch(_:))) commandCenter.playCommand.addTarget(self, action: #selector(self.playSongTouch(_:))) commandCenter.nextTrackCommand.addTarget(self, action: #selector(self.nextSongTouch(_:))) commandCenter.previousTrackCommand.addTarget(self, action: #selector(self.previousSongTouch(_:))) commandCenter.changePlaybackPositionCommand.addTarget(self, action: #selector(self.changedThumbSlider(_:))) setLockInfo() } func changedThumbSlider(_ event: MPChangePlaybackPositionCommandEvent) -> MPRemoteCommandHandlerStatus { audioPlayer.currentTime = event.positionTime setLockInfo() return .success } func setLockInfo() { let image = PlayerVC.songs[PlayerVC.currentSelection].image let artwork = MPMediaItemArtwork.init(boundsSize: image.size, requestHandler: { (size) -> UIImage in return image }) let songInfo : [String : Any] = [MPMediaItemPropertyTitle : PlayerVC.songs[PlayerVC.currentSelection].name, MPMediaItemPropertyArtwork : artwork, MPNowPlayingInfoPropertyElapsedPlaybackTime : TimeInterval(audioPlayer.currentTime), MPNowPlayingInfoPropertyPlaybackRate : 1, MPMediaItemPropertyPlaybackDuration : audioPlayer.duration, MPMediaItemPropertyArtist : "Artist"] MPNowPlayingInfoCenter.default().nowPlayingInfo = songInfo } Artist func remotePlayerInit() { UIApplication.shared.beginReceivingRemoteControlEvents() let commandCenter = MPRemoteCommandCenter.shared() commandCenter.pauseCommand.addTarget(self, action: #selector(self.pauseSongTouch(_:))) commandCenter.playCommand.addTarget(self, action: #selector(self.playSongTouch(_:))) commandCenter.nextTrackCommand.addTarget(self, action: #selector(self.nextSongTouch(_:))) commandCenter.previousTrackCommand.addTarget(self, action: #selector(self.previousSongTouch(_:))) commandCenter.changePlaybackPositionCommand.addTarget(self, action: #selector(self.changedThumbSlider(_:))) setLockInfo() } func changedThumbSlider(_ event: MPChangePlaybackPositionCommandEvent) -> MPRemoteCommandHandlerStatus { audioPlayer.currentTime = event.positionTime setLockInfo() return .success } func setLockInfo() { let image = PlayerVC.songs[PlayerVC.currentSelection].image let artwork = MPMediaItemArtwork.init(boundsSize: image.size, requestHandler: { (size) -> UIImage in return image }) let songInfo : [String : Any] = [MPMediaItemPropertyTitle : PlayerVC.songs[PlayerVC.currentSelection].name, MPMediaItemPropertyArtwork : artwork, MPNowPlayingInfoPropertyElapsedPlaybackTime : TimeInterval(audioPlayer.currentTime), MPNowPlayingInfoPropertyPlaybackRate : 1, MPMediaItemPropertyPlaybackDuration : audioPlayer.duration, MPMediaItemPropertyArtist : "Artist"] MPNowPlayingInfoCenter.default().nowPlayingInfo = songInfo }