iOS - AVPlayer seekToTime重新启动currentItem的播放 [英] iOS - AVPlayer seekToTime restarts playback of currentItem

问题描述

我在做一个使用AVPlayer的应用程序。在我的一个视图中，我有一个UISlider，用户应该能够向前和向后擦洗。我有一些麻烦获得 seekToTime 按我想要的工作。当我尝试改变时间播放从0开始，我不知道如何解决这个问题。我当前的实现是这样的：

  [self.progressSlider addTarget：self action：@selector（sliderValueChanged）forControlEvents：UIControlEventValueChanged]; 
 
 [self.progressSlider addTarget：self action：@selector（sliderReleased）forControlEvents：UIControlEventTouchUpInside]; 
 
 
  - （void）sliderValueChanged {
 
 [...] 
 [播放器暂停]; 
 
} 
 
  - （void）sliderReleased {
 
 float timeInSecond = self.progressSlider.value; 
 
 timeInSecond * = 1000; 
 
 //我有trie硬编码这个值，但我得到相同的结果。 
 CMTime cmTime = CMTimeMake（timeInSecond，NSEC_PER_SEC）; 
 
 [player.currentItem seekToTime：cmTime toleranceBefore：kCMTimeZero toleranceAfter：kCMTimeZero completionHandler：^（BOOL finished）{
 
 if（finished）{
 [player play] ; 
} 
}]; 
} 
  

对我做错了什么想法？

可以提到我使用AVPlayer的<：code> playerItemWithURL 流式传输音频。

NSEC_PER_SEC 是1,000,000,000，因此 CMTimeMake（timeInSecond，NSEC_PER_SEC）将是一个非常小的数字（除非 timeInSecond 是可笑的巨大） - 事实上，它会随机接近零，这正是你的体验。

只要清楚： CMTimeMake 定义一个有理数。你给分子和分母。如果你的分母是巨大的，理性数将是微小的。

I'm making an app that uses AVPlayer. In one of my views I have a UISlider with which the user should be able to scrub forward and backward. I'm having some trouble getting seekToTime to work as I want. When I try to change time the playback starts from 0, and I'm not sure how to solve this. My current implementation looks like this:

[self.progressSlider  addTarget:self action:@selector(sliderValueChanged) forControlEvents:UIControlEventValueChanged];

[self.progressSlider  addTarget:self action:@selector(sliderReleased) forControlEvents:UIControlEventTouchUpInside];


- (void)sliderValueChanged {

    [...]
    [player pause];

}

- (void)sliderReleased {

    float timeInSecond = self.progressSlider.value;

    timeInSecond *= 1000;

    // I have trie to hard code this value, but I get the same result.
    CMTime cmTime = CMTimeMake(timeInSecond, NSEC_PER_SEC);

    [player.currentItem seekToTime:cmTime toleranceBefore:kCMTimeZero toleranceAfter:kCMTimeZero completionHandler:^(BOOL finished) {

        if (finished) {
            [player play];
        }
    }];
}

Any ideas on what I'm doing wrong?

Can mention that I stream audio using AVPlayer's: playerItemWithURL if that makes any difference.

解决方案

One problem is that NSEC_PER_SEC is 1,000,000,000, so CMTimeMake(timeInSecond, NSEC_PER_SEC) is going to be a really tiny number (unless timeInSecond is ridiculously huge) - in fact, it will be arbitrarily close to zero, which is exactly what you are experiencing.

Just to be clear: CMTimeMake defines a rational number. You are giving a numerator and a denominator. If your denominator is huge, the rational number will be tiny.

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