 
     playButton.setImage(#imageLiteral(resourceName: "PlayButton"), for: .normal)
     playButton.sizeToFit()
-    playButton.addTarget(self, action: #selector(play as (Void) -> Void), for: .touchUpInside)
+    playButton.addTarget(self, action: #selector(play as () -> Void), for: .touchUpInside)
     addSubview(playButton)
 
     playButton.translatesAutoresizingMaskIntoConstraints = false

    mpic.nowPlayingInfo?[MPNowPlayingInfoPropertyElapsedPlaybackTime] = audioPlayer.currentTime().seconds
  }

  func progressBarTapped(recognizer: UITapGestureRecognizer) {
    guard let view = recognizer.view else { return }

    let pt = recognizer.location(in: view)

    }

    let mpcc = MPRemoteCommandCenter.shared()
    mpcc.playCommand.addTarget(self, action: #selector(play as () -> Void))
    mpcc.pauseCommand.addTarget(self, action: #selector(pause))
    mpcc.nextTrackCommand.addTarget(self, action: #selector(nextTrack))
    mpcc.previousTrackCommand.addTarget(self, action: #selector(previousTrack))
