Как обновить AVAudio рекордер с движением ползунка с обновлением значения ползунка в метках?

Question

if (isPlaying == NO)

{

[_ playBtn setImage: [UIImage imageNamed: @ "pause"] forState: UIControlStateNormal];

    [audioPlayer play];
   // UISlider *mySlider = _playSlider;

    _playSlider.value = audioPlayer.currentTime


    _playStartLbl.text = [NSString stringWithFormat:@"0:%d",(int)(audioPlayer.currentTime)];

    [_playSlider setMaximumValue:(int)(audioPlayer.duration)];

    NSLog(@"Current Time:%d",(int)(audioPlayer.duration));
    _playEndLbl.text = [NSString stringWithFormat:@"0:%d",(int)(audioPlayer.duration)];

}

else

{
    [_playBtn setImage:[UIImage imageNamed:@"play"] forState:UIControlStateNormal];
    [audioPlayer pause];
    _playSlider.value = 0;

}
isPlaying = !isPlaying;

}