objective c - iOS 7 rewind songs on lock screen using AVPlayer

Question

I havn't found the way how to rewind song from lock screen iOS 7. Volume slider is available, all the buttons work correctly but the upper slider is not available!

AVPlayer is the class I'm using.

Any help is appreciated!

Answer 1

You'll need to set this in the "now-playing info".

Whenever the item (track) changes, do something like

NSMutableDictionary *nowPlayingInfo = [[NSMutableDictionary alloc] init];
[nowPlayingInfo setObject:track.artistName forKey:MPMediaItemPropertyArtist];
[nowPlayingInfo setObject:track.trackTitle forKey:MPMediaItemPropertyTitle];
...
[nowPlayingInfo setObject:[NSNumber numberWithDouble:self.player.rate] forKey:MPNowPlayingInfoPropertyPlaybackRate];
[nowPlayingInfo setObject:[NSNumber numberWithDouble:self.currentPlaybackTime] forKey:MPNowPlayingInfoPropertyElapsedPlaybackTime];
[MPNowPlayingInfoCenter defaultCenter].nowPlayingInfo = nowPlayingInfo;

Whenever the playback rate changes (play/pause), do

NSMutableDictionary *nowPlayingInfo = [[MPNowPlayingInfoCenter defaultCenter].nowPlayingInfo mutableCopy];
[nowPlayingInfo setObject:[NSNumber numberWithDouble:self.player.rate] forKey:MPNowPlayingInfoPropertyPlaybackRate];
[nowPlayingInfo setObject:[NSNumber numberWithDouble:self.currentPlaybackTime] forKey:MPNowPlayingInfoPropertyElapsedPlaybackTime];
[MPNowPlayingInfoCenter defaultCenter].nowPlayingInfo = nowPlayingInfo;

You can get the current playback time like this:

- (NSTimeInterval)currentPlaybackTime {
  CMTime time = self.player.currentTime;
  if (CMTIME_IS_VALID(time)) {
    return time.value / time.timescale;
  }
  return 0;
}