How to change track position on lock screen/control center?

Question

When playing a song with the ios 7 music app the user can use slider to change song position in the lock screen/the control center. Slider is active:

Answer 1

swift4 You can change track position with help of MPRemoteCommandCenter on iOS 9.1 and higher.

let commandCenter = MPRemoteCommandCenter.shared()
commandCenter.changePlaybackPositionCommand.isEnabled = true
commandCenter.changePlaybackPositionCommand.addTarget(
 self, action:#selector(changePlaybackPositionCommand(_:)))

and method

@objc func changePlaybackPositionCommand(_ event:
          MPChangePlaybackPositionCommandEvent) -> MPRemoteCommandHandlerStatus {
    let time = event.positionTime
    //use time to update your track time
    return MPRemoteCommandHandlerStatus.success
}

Note that you have to do that for every command in commandCenter if you want that commend to be enabled.