AVPlayer快速向前/向後跳過平移手勢

Question

過去兩天我一直在用煩人的毛刺抨擊我的頭，並希望有人能夠擺脫一些光線。

基本設置：我有一個球員，在視圖中平移手勢識別的AVPlayerLayer，我希望用戶能夠將他們的手指輕掃來回視頻將相應地尋求。

美中不足的是：如果用戶再次提起他們的手指，並把它，在屏幕任意位置的快進或後退的，我想繼續在離開的地方的確切相同的幀，並繼續從進展那裏。

我見過這兩個問題： Pan Gesture with AVPlayer和 Pan to seek AVPlayer

我在這裏試過蘋果的建議：https://developer.apple.com/library/content/qa/qa1820/_index.html 爲好，但問題是，每當我開始一個新的移動手勢，玩家跳躍幾幀，然後恢復。

我最近的做法是設置當前時間，一旦查找完成塊完成，然後嘗試追加新的查找時間。

這裏是我的設置：

self.item = [AVPlayerItem playerItemWithURL:resource]; 
self.player = [AVPlayer playerWithPlayerItem:self.item]; 
self.playerLayer = [AVPlayerLayer playerLayerWithPlayer:self.player]; 

[self.view.layer addSublayer:self.playerLayer]; 
self.playerLayer.frame = self.view.bounds; 

UIPanGestureRecognizer *recognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)]; 

[self.view addGestureRecognizer:recognizer]; 

我的手勢識別處理：

- (void)swipe:(UIPanGestureRecognizer *)paramRecognizer 
{ 
    switch(paramRecognizer.state) { 
     // case UIGestureRecognizerStateBegan: 
     case UIGestureRecognizerStateChanged: 
     { 
      [self.player pause]; 

      CGPoint translation = [paramRecognizer translationInView:self.view]; 

      float horizontalTranslation = translation.x; 

      float durationInSeconds = CMTimeGetSeconds(self.player.currentItem.asset.duration); 

      //I'd like to be able to swipe across the whole view. 
      float translationLimit = self.view.bounds.size.width; 
      float minTranslation = 0; 
      float maxTranslation = translationLimit; 

      if (horizontalTranslation > maxTranslation) { 
       horizontalTranslation = maxTranslation; 
      } 

      if (horizontalTranslation < minTranslation) { 
       horizontalTranslation = minTranslation; 
      } 

     float timeToSeekTo = [self normalize:horizontalTranslation 
           andMinDelta:minTranslation 
           andMaxDelta:maxTranslation 
           andMinDuration:0 
           andMaxDuration:durationInSeconds]; 

      if(CMTIME_IS_VALID(self.currentTime)){ 
       float seconds = self.currentTime.value/self.currentTime.timescale; 

       [self.player seekToTime:CMTimeMakeWithSeconds(seconds+timeToSeekTo, self.player.currentTime.timescale) 
         toleranceBefore:kCMTimeZero 
         toleranceAfter:kCMTimeZero completionHandler:^(BOOL finished) 
       { 
        if(finished) 
        self.currentTime = self.player.currentItem.currentTime; 
       }]; 
      } 
      else 
      { 
       [self.player seekToTime:CMTimeMakeWithSeconds(timeToSeekTo, 
                   self.player.currentTime.timescale) toleranceBefore:kCMTimeZero 
         toleranceAfter:kCMTimeZero completionHandler:^(BOOL finished) { 
          if(finished) 
        self.currentTime = self.player.currentItem.currentTime; 
       }]; 
      } 

     } 
      break; 
    } 
} 

的標準化的方法是這樣的：

- (float) normalize:(float)delta 
    andMinDelta:(float)minDelta 
    andMaxDelta:(float)maxDelta 
andMinDuration:(float)minDuration 
andMaxDuration:(float)maxDuration{ 

float result = ((delta - minDelta) * (maxDuration - minDuration)/(maxDelta - minDelta) + minDuration); 
return result; 

}

任何幫助極端非常感謝！

Answer 1

對UIGestureRecognizerStateBegan保存CMTime通過從AVPlayer然後做你的德爾塔變化平移，然後在UIGestureRecognizerStateEnded只是尋求回到原來的保存時間？

只是爲了平滑尋求注意不要暫停視頻，設置速度爲0