AVPlayer的时间轴进度条

问题描述

AVPlayer 是完全可自定义的，遗憾的是 AVPlayer 中有方便的方法来显示时间线进度条。

AVPlayer is fully customizable, unfortunately there are convenient methods in AVPlayer for showing the time line progress bar.

AVPlayer *player = [AVPlayer playerWithURL:URL];
AVPlayerLayer *playerLayer = [[AVPlayerLayer playerLayerWithPlayer:avPlayer] retain];[self.view.layer addSubLayer:playerLayer];

我有一个进度条，指示视频的播放方式，以及剩余的数量 MPMoviePlayer 。

I have an progress bar that indicates the how video has been played, and how much remained just as like MPMoviePlayer.

那么如何从 AVPlayer 以及如何更新进度条

So how to get the timeline of video from AVPlayer and how to update the progress bar

建议我。

推荐答案

请使用以下代码，该代码来自苹果示例代码AVPlayerDemo。

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);
}

在syncScrubber方法中更新UISlider或UIProgressBar值。

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];
    }
} 

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