Timeline Progress bar for AVPlayer

Please use the below code which is from apple example code "AVPlayerDemo".

    double interval = .1f;  

    CMTime playerDuration = [self playerItemDuration]; // return player duration.
    if (CMTIME_IS_INVALID(playerDuration)) 
    {
        return;
    } 
    double duration = CMTimeGetSeconds(playerDuration);
    if (isfinite(duration))
    {
        CGFloat width = CGRectGetWidth([yourSlider bounds]);
        interval = 0.5f * duration / width;
    }

    /* Update the scrubber during normal playback. */
    timeObserver = [[player addPeriodicTimeObserverForInterval:CMTimeMakeWithSeconds(interval, NSEC_PER_SEC) 
                                                          queue:NULL 
                                                     usingBlock:
                                                      ^(CMTime time) 
                                                      {
                                                          [self syncScrubber];
                                                      }] retain];


- (CMTime)playerItemDuration
{
    AVPlayerItem *thePlayerItem = [player currentItem];
    if (thePlayerItem.status == AVPlayerItemStatusReadyToPlay)
    {        

        return([playerItem duration]);
    }

    return(kCMTimeInvalid);
}

And in syncScrubber method update the UISlider or UIProgressBar value.

- (void)syncScrubber
{
    CMTime playerDuration = [self playerItemDuration];
    if (CMTIME_IS_INVALID(playerDuration)) 
    {
        yourSlider.minimumValue = 0.0;
        return;
    } 

    double duration = CMTimeGetSeconds(playerDuration);
    if (isfinite(duration) && (duration > 0))
    {
        float minValue = [ yourSlider minimumValue];
        float maxValue = [ yourSlider maximumValue];
        double time = CMTimeGetSeconds([player currentTime]);
        [yourSlider setValue:(maxValue - minValue) * time / duration + minValue];
    }
} 

    let progressView = UIProgressView(progressViewStyle: UIProgressViewStyle.Bar)
    self.view.addSubview(progressView)
    progressView.constrainHeight("\(1.0/UIScreen.mainScreen().scale)")
    progressView.alignLeading("", trailing: "", toView: self.view)
    progressView.alignBottomEdgeWithView(self.view, predicate: "")
    player.addPeriodicTimeObserverForInterval(CMTimeMakeWithSeconds(1/30.0, Int32(NSEC_PER_SEC)), queue: nil) { time in
        let duration = CMTimeGetSeconds(playerItem.duration)
        progressView.progress = Float((CMTimeGetSeconds(time) / duration))
    }

Thanks to iOSPawan for the code! I simplified the code to the necessary lines. This might be more clear to understand the concept. Basically I have implemented it like this and it works fine.

Before starting the video:

__weak NSObject *weakSelf = self;    
[_player addPeriodicTimeObserverForInterval:CMTimeMakeWithSeconds(1.0 / 60.0, NSEC_PER_SEC)
                                      queue:NULL
                                 usingBlock:^(CMTime time){
                                                [weakSelf updateProgressBar];
                                             }];

[_player play];

Then you need to have a method to update your progress bar:

- (void)updateProgressBar
{
    double duration = CMTimeGetSeconds(_playerItem.duration);
    double time = CMTimeGetSeconds(_player.currentTime);
    _progressView.progress = (CGFloat) (time / duration);
}