I am trying to get MPNowPlayingInfoCenter to work properly when pausing playback. (I have a streaming music app that uses AVPlayer for playback, and I am playing back in my Apple TV over Airplay.) Everything but pausing seems to be reflected correctly in the Apple TV UI. I am initializing it like this:
MPNowPlayingInfoCenter *center = [MPNowPlayingInfoCenter defaultCenter];
NSDictionary *songInfo = @{
MPMediaItemPropertyTitle: title,
MPMediaItemPropertyArtist: artist
};
center.nowPlayingInfo = songInfo;
Since I am streaming, I do not have duration info upon starting the playback. When I get “ready” signal from the stream, I update the duration that shows up correctly on my Apple TV:
MPNowPlayingInfoCenter *center = [MPNowPlayingInfoCenter defaultCenter];
NSMutableDictionary *playingInfo = [NSMutableDictionary dictionaryWithDictionary:center.nowPlayingInfo];
[playingInfo setObject:[NSNumber numberWithFloat:length] forKey:MPMediaItemPropertyPlaybackDuration];
center.nowPlayingInfo = playingInfo;
I can also seek with this technique when the user seeks the track:
[playingInfo setObject:[NSNumber numberWithFloat:length * targetProgress] forKey:MPNowPlayingInfoPropertyElapsedPlaybackTime];
The one thing I can NOT figure out is, how to pause the playhead on my Apple TV. When user taps pause in my UI, I am trying to do something like:
MPNowPlayingInfoCenter *center = [MPNowPlayingInfoCenter defaultCenter];
NSMutableDictionary *playingInfo = [NSMutableDictionary dictionaryWithDictionary:center.nowPlayingInfo];
[playingInfo setObject:[NSNumber numberWithFloat:0.0f] forKey:MPNowPlayingInfoPropertyPlaybackRate];
center.nowPlayingInfo = playingInfo;
Instead of pausing, this seeks the playhead back to zero and keeps advancing it.
How do I get the playhead to pause correctly in my Apple TV UI?
I've the solution! Set only the MPMediaItemPropertyPlaybackDuration
1 - When you start the track, set the property with the total duration of the track:
MPNowPlayingInfoCenter *center = [MPNowPlayingInfoCenter defaultCenter];
NSDictionary *songInfo = @{
MPMediaItemPropertyTitle: title,
MPMediaItemPropertyArtist: artist
MPMediaItemPropertyPlaybackDuration : [NSNumber numberWithFloat:length]
};
center.nowPlayingInfo = songInfo;
2 - when you pause the track... do nothing.
3 - when you play the track, set the property with the currentTrackTime:
MPNowPlayingInfoCenter *center = [MPNowPlayingInfoCenter defaultCenter];
NSMutableDictionary *playingInfo = [NSMutableDictionary dictionaryWithDictionary:center.nowPlayingInfo];
[playingInfo setObject:[NSNumber numberWithFloat:player.currentTrackTime] forKey:MPNowPlayingInfoPropertyElapsedPlaybackTime];
center.nowPlayingInfo = playingInfo;