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!

Answer 1

You have to register for different events like below in swift

    MPRemoteCommandCenter.shared().playCommand.addTarget(self, action: #selector(self.handleRemoteCommandActions))
    MPRemoteCommandCenter.shared().nextTrackCommand.addTarget(self, action: #selector(self.handleRemoteCommandActions))
    MPRemoteCommandCenter.shared().previousTrackCommand.addTarget(self, action: #selector(self.handleRemoteCommandActions))
    MPRemoteCommandCenter.shared().stopCommand.addTarget(self, action: #selector(self.handleRemoteCommandActions))
    MPRemoteCommandCenter.shared().pauseCommand.addTarget(self, action: #selector(self.handleRemoteCommandActions))
    MPRemoteCommandCenter.shared().changePlaybackPositionCommand.isEnabled = true
    MPRemoteCommandCenter.shared().changePlaybackPositionCommand.addTarget(self, action: #selector(self.handleChangePlaybackPositionRemoteCommandActions))

    let rcc = MPRemoteCommandCenter.shared()
    let skipBackwardIntervalCommand: MPSkipIntervalCommand? = rcc.skipBackwardCommand
    skipBackwardIntervalCommand?.isEnabled = false
    let skipForwardIntervalCommand: MPSkipIntervalCommand? = rcc.skipForwardCommand
    skipForwardIntervalCommand?.isEnabled = false
    let seekForwardCommand: MPRemoteCommand? = rcc.seekForwardCommand
    seekForwardCommand?.isEnabled = true
    rcc.changePlaybackPositionCommand.isEnabled = true
    rcc.changePlaybackRateCommand.isEnabled = true
    rcc.ratingCommand.isEnabled = true
    rcc.playCommand.isEnabled = true
    rcc.togglePlayPauseCommand.isEnabled = true

here handleChangePlaybackPositionRemoteCommandActions this method will be your method which will have to manage seeking of song when scrubber (upper slider) changes its value

it will look something like below:-

@objc func handleChangePlaybackPositionRemoteCommandActions(event:MPChangePlaybackPositionCommandEvent) -> MPRemoteCommandHandlerStatus
{
    print("handleChangePlaybackPositionRemoteCommandActions : \(event.positionTime)")
    self.appDelegate.audioPlayer?.seek(to: CMTime(seconds: event.positionTime, preferredTimescale: (self.appDelegate.audioPlayer?.currentItem?.currentTime().timescale)!))

    MPNowPlayingInfoCenter.default().nowPlayingInfo![MPNowPlayingInfoPropertyElapsedPlaybackTime] = event.positionTime

    return MPRemoteCommandHandlerStatus.success
}