AVPlayer seekToTime:向后不工作

Question

我有以下代码：

AVPlayerItem *currentItem = [AVPlayerItem playerItemWithURL:soundURL];
[self.audioPlayer replaceCurrentItemWithPlayerItem:currentItem];
[self.audioPlayer play];

其中soundURL是remoteURL。效果很好。AVPlayer完美地播放了音乐。我有一个进度条，我正在根据球员的当前时间来更新它。

一切都很好。我的问题是，当我向前拖动进度条时，audioplayer从新位置开始，但是如果我拖动progressbar，它不会从新位置开始，实际上它会从前一个位置恢复。下面是我的进度条，拖动“开始”和“停止”代码：

- (IBAction)progressBarDraggingStart:(id)sender
{
     if (self.audioPlayer.rate != 0.0)
     {
          [self.audioPlayer pause];
     }
}

- (IBAction)progressBarDraggindStop:(id)sender
{
     CMTime newTime = CMTimeMakeWithSeconds(self.progressBar.value, 1);
     [self.audioPlayer seekToTime:newTime];
     [self.audioPlayer play];
}

有人能帮我解决这个问题吗？

Answer 1

我建议你做几件事。首先，获取timescale值并将其传递给CMTime结构。第二，使用seekToTime:toleranceBefore:toleranceAfter:completionHandler:方法进行更精确的搜索。例如，您的代码如下所示：

- (IBAction)progressBarDraggindStop:(id)sender {
    int32_t timeScale = self.audioPlayer.currentItem.asset.duration.timescale;

    [self.audioPlayer seekToTime: CMTimeMakeWithSeconds(self.progressBar.value, timeScale)
                 toleranceBefore: kCMTimeZero
                  toleranceAfter: kCMTimeZero
               completionHandler: ^(BOOL finished) {
                   [self.audioPlayer play];
               }];
}

Answer 2

我使用下面的代码在@Corey的答案之后拖动添加的completionHandler，它工作得很好，没有任何web服务依赖：

- (void) sliderValueChanged:(id)sender {
    if ([sender isKindOfClass:[UISlider class]]) {
        UISlider *slider = sender;

        CMTime playerDuration = self.avPlayer.currentItem.duration;
        if (CMTIME_IS_INVALID(playerDuration)) {
            return;
        }

        double duration = CMTimeGetSeconds(playerDuration);
        if (isfinite(duration)) {
            float minValue = [slider minimumValue];
            float maxValue = [slider maximumValue];
            float value = [slider value];

            double time = duration * (value - minValue) / (maxValue - minValue);

            [self.avPlayer seekToTime:CMTimeMakeWithSeconds(time, NSEC_PER_SEC) toleranceBefore:kCMTimeZero toleranceAfter:kCMTimeZero completionHandler:^(BOOL finished) {
                [self.avPlayer play];
            }];
        }
    }
}