iphone - How to set current playback duration and elapsed time on iOS 7 lockscreen?

Question

Starting from iOS 5, every music player can set current playing music information such as title, artist, album title, and artwork on [MPNowPlayingInfoCenter defaultCenter].nowPlayingInfo to show on lock screen.

On iOS 7, playback position slider, duration, and elapsed time information are added to both lock screen and control center. However, I cannot find any documents to set these kinds of information and enable the slider to change playback position.

Is there any way to solve this problem?

Answer 1

You need to setup playback rate to 1.0f even if documentation says it's 1.0 by default.

NSDictionary *mediaInfo = @{
    MPMediaItemPropertyTitle: audio.title,
    MPMediaItemPropertyArtist: audio.artist,
    MPMediaItemPropertyPlaybackDuration: audio.duration,
    MPNowPlayingInfoPropertyPlaybackRate: @(1.0)
};

[[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:mediaInfo];