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

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.

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

if (floor(NSFoundationVersionNumber) > NSFoundationVersionNumber_iOS_9_0) {
            MPRemoteCommandCenter *commandCenter = [MPRemoteCommandCenter sharedCommandCenter];
            [commandCenter.changePlaybackPositionCommand setEnabled:true];
            [commandCenter.changePlaybackPositionCommand addTarget:self action:@selector(changedThumbSliderOnLockScreen:)];
        }

and method

- (MPRemoteCommandHandlerStatus)changedThumbSliderOnLockScreen:(MPChangePlaybackPositionCommandEvent *)event
{
    // change position
    [self setCurrentPlaybackTime:event.positionTime];
    // update MPNowPlayingInfoPropertyElapsedPlaybackTime
    [[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:songInfo];

    return MPRemoteCommandHandlerStatusSuccess;
}

I was looking for the same thing but I don't think this is possible see this post:

How to enable audio scrubber in iOS Lock Screen control panel?

Also popular apps like Spotify and Soundcloud don't have this implemented.

If you are looking for a way to show the current music on the lock screen you need to do the following.

First when you play a new track update the NowPlayingInfo :

NSMutableDictionary *songInfo = [[NSMutableDictionary alloc] init];

    [songInfo setObject:trackTitle forKey:MPMediaItemPropertyTitle];
    [songInfo setObject:artistName forKey:MPMediaItemPropertyArtist];
    [songInfo setObject:duration forKey:MPMediaItemPropertyPlaybackDuration];
    [songInfo setObject:releaseDate forKey:MPMediaItemPropertyReleaseDate];
    [songInfo setValue:playbackRate forKey:MPNowPlayingInfoPropertyPlaybackRate];
    [songInfo setObject:elapsedTime forKey:MPNowPlayingInfoPropertyElapsedPlaybackTime];
    [songInfo setObject:albumArtImage forKey:MPMediaItemPropertyArtwork];
    [[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:songInfo];

To handle events from the Lockscreen, you first need to tell your app to start receiving events from the remote control. I do this in the application didFinishLaunchingWithOptions of my AppDelegate using the following code

 // Turn on remote control event delivery
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];

Next you need to implement remoteControlReceivedWithEvent method to handle the captured events. In APPDelegate add the following method

- (void)remoteControlReceivedWithEvent:(UIEvent *)receivedEvent {

 if (receivedEvent.type == UIEventTypeRemoteControl) {

    switch (receivedEvent.subtype) {
        case UIEventSubtypeRemoteControlPause:
            //pause code here
            break;

        case UIEventSubtypeRemoteControlPlay:
             //play code here
            break;

        case UIEventSubtypeRemoteControlPreviousTrack:
            // previous track code here
            break;

        case UIEventSubtypeRemoteControlNextTrack:
            //next track code here
            break;

        default:
            break;
    }
 }

}

More info on MPNowPlayingInfoCenter from the apple docs -> https://developer.apple.com/library/ios/documentation/mediaplayer/reference/MPNowPlayingInfoCenter_Class