AVAudioPlayer on Lock Screen

avaudioplayer, avaudiosession, background-audio, ios, mpnowplayinginfocenter

Solution

You are correct, `MPNowPlayingInfoCenter` is the only way to do this. So go ahead and link with `MediaPlayer.framework`. In the class that handles playing tracks, import `<MediaPlayer/MediaPlayer.h>`. Whenever your track changes, do this:

NSDictionary *info = @{ MPMediaItemPropertyArtist: artistName,
                            MPMediaItemPropertyAlbumTitle: albumName,
                            MPMediaItemPropertyTitle: songName };

    [MPNowPlayingInfoCenter defaultCenter].nowPlayingInfo = info;

Problem

I've implemented an audio player using `AVAudioPlayer` (not `AVPlayer`). I'm able to handle the remote control events with the following method. It works quite alright so far, however I see two more `subtypes` for these events: `UIEventSubtypeRemoteControlEndSeekingForward` and `UIEventSubtypeRemoteControlEndSeekingBackward`. ``` - (void)remoteControlReceivedWithEvent:(UIEvent *)event { //if it is a remote control event handle it correctly if (event.type == UIEventTypeRemoteControl) { if (event.subtype == UIEventSubtypeRemoteControlPlay) { [self playAudio]; } else if (event.subtype == UIEventSubtypeRemoteControlPause) { [self pauseAudio]; } else if (event.subtype == UIEventSubtypeRemoteControlTogglePlayPause) { [self togglePlayPause]; } else if (event.subtype == UIEventSubtypeRemoteControlBeginSeekingBackward) { [self rewindTheAudio]; //this method rewinds the audio by 15 seconds. } else if (event.subtype == UIEventSubtypeRemoteControlBeginSeekingForward) { [self fastForwardTheAudio]; //this method fast-forwards the audio by 15 seconds. } } ``` So the questions: In order to have things work right, am I supposed to implement those two subtypes, too? This method only enables the `rewind`, `play/pause`, and `fast forward` buttons on lock screen, but it doesn't display the file title, artwork, and duration. How can I display that info using `AVAudioPlayer` or `AVAudioSession` (I don't really want one more library/API to implement this)? 2-a. I discovered `MPNowPlayingInfoCenter` while searching and I don't know much about it. Do I have to use it to implement those stuff above? :-[

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