Question

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

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

我有一个进度条，用于指示视频的播放方式，以及与MPMoviePlayer保持一致的数量。

那么如何从AVPlayer获取视频的时间轴以及如何更新进度条

建议我。

Answer 1

请使用以下代码，该代码来自苹果示例代码“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。

- (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];
    }
}

Answer 2

感谢iOSPawan的代码！我将代码简化为必要的行。理解这个概念可能更清楚。基本上我已经像这样实现它并且它工作正常。

在开始播放视频之前：

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

[_player play];

然后你需要一个方法来更新你的进度条：

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

Answer 3

    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))
    }

Answer 4

在我的例子中，以下代码适用于Swift 3：

var timeObserver: Any?
override func viewDidLoad() {
    ........
    let interval = CMTime(seconds: 0.05, preferredTimescale: CMTimeScale(NSEC_PER_SEC))
    timeObserver = avPlayer.addPeriodicTimeObserver(forInterval: interval, queue: DispatchQueue.main, using: { elapsedTime in
            self.updateSlider(elapsedTime: elapsedTime)     
        })
}

func updateSlider(elapsedTime: CMTime) {
    let playerDuration = playerItemDuration()
    if CMTIME_IS_INVALID(playerDuration) {
        seekSlider.minimumValue = 0.0
        return
    }
    let duration = Float(CMTimeGetSeconds(playerDuration))
    if duration.isFinite && duration > 0 {
        seekSlider.minimumValue = 0.0
        seekSlider.maximumValue = duration
        let time = Float(CMTimeGetSeconds(elapsedTime))
        seekSlider.setValue(time, animated: true)  
    }
}

private func playerItemDuration() -> CMTime {
    let thePlayerItem = avPlayer.currentItem
    if thePlayerItem?.status == .readyToPlay {
        return thePlayerItem!.duration
    }
    return kCMTimeInvalid
}

override func viewDidDisappear(_ animated: Bool) {
    super.viewDidDisappear(animated)
    avPlayer.removeTimeObserver(timeObserver!)   
}

Answer 5

时间轴我这样做

-(void)changeSliderValue {

double duration = CMTimeGetSeconds(self.player.currentItem.duration);

[lengthSlider setMaximumValue:(float)duration];

lengthSlider.value = CMTimeGetSeconds([self.player currentTime]);

int seconds = lengthSlider.value,minutes = seconds/60,hours = minutes/60;

int secondsRemain = lengthSlider.maximumValue - seconds,minutesRemain = secondsRemain/60,hoursRemain = minutesRemain/60;

seconds = seconds-minutes*60;

minutes = minutes-hours*60;

secondsRemain = secondsRemain - minutesRemain*60;

minutesRemain = minutesRemain - hoursRemain*60;

NSString *hourStr,*minuteStr,*secondStr,*hourStrRemain,*minuteStrRemain,*secondStrRemain;

hourStr = hours > 9 ? [NSString stringWithFormat:@"%d",hours] : [NSString stringWithFormat:@"0%d",hours];

minuteStr = minutes > 9 ? [NSString stringWithFormat:@"%d",minutes] : [NSString stringWithFormat:@"0%d",minutes];

secondStr = seconds > 9 ? [NSString stringWithFormat:@"%d",seconds] : [NSString stringWithFormat:@"0%d",seconds];

hourStrRemain = hoursRemain > 9 ? [NSString stringWithFormat:@"%d",hoursRemain] : [NSString stringWithFormat:@"0%d",hoursRemain];

minuteStrRemain = minutesRemain > 9 ? [NSString stringWithFormat:@"%d",minutesRemain] : [NSString stringWithFormat:@"0%d",minutesRemain];

secondStrRemain = secondsRemain > 9 ? [NSString stringWithFormat:@"%d",secondsRemain] : [NSString stringWithFormat:@"0%d",secondsRemain];

timePlayed.text = [NSString stringWithFormat:@"%@:%@:%@",hourStr,minuteStr,secondStr];

timeRemain.text = [NSString stringWithFormat:@"-%@:%@:%@",hourStrRemain,minuteStrRemain,secondStrRemain];

并导入CoreMedia框架

lengthSlider是UISlider

Answer 6

我知道这是一个老问题，但有人可能会发现它有用。这只是Swift版本：

 //set the timer, which will update your progress bar. You can use whatever time interval you want

 private func setupProgressTimer() {
    timer = Timer.scheduledTimer(withTimeInterval: 0.02, repeats: true, block: { [weak self] (completion) in
        guard let self = self else { return }
        self.updateProgress()
    })
}

//update progression of video, based on it's own data

private func updateProgress() {
    guard let duration = player?.currentItem?.duration.seconds,
        let currentMoment = player?.currentItem?.currentTime().seconds else { return }

    progressBar.progress = Float(currentMoment / duration)
}

Answer 7

我从iOSPawan和Raphael那里得到了答案，然后根据我的需要进行了调整。所以我有音乐和UIProgressView，它总是处于循环状态，当你进入下一个屏幕然后回到歌曲时，它继续留在原来的位置。

代码：

ngOnInit()

Answer 8

迅速获得进展的答案：

private func addPeriodicTimeObserver() {
        // Invoke callback every half second
        let interval = CMTime(seconds: 0.5,
                              preferredTimescale: CMTimeScale(NSEC_PER_SEC))
        // Queue on which to invoke the callback
        let mainQueue = DispatchQueue.main
        // Add time observer
        self.playerController?.player?.addPeriodicTimeObserver(forInterval: interval, queue: mainQueue) { [weak self] time in
            let currentSeconds = CMTimeGetSeconds(time)
            guard let duration = self?.playerController?.player?.currentItem?.duration else { return }
            let totalSeconds = CMTimeGetSeconds(duration)
            let progress: Float = Float(currentSeconds/totalSeconds)
            print(progress)
        }
    }

Ref

AVPlayer的时间轴进度条

8 个答案: