如何检测UISwipeGestureRecognizer的结尾? [英] How to detect end of UISwipeGestureRecognizer?

问题描述

从Apple文档

滑动是一种离散手势，因此每个手势仅发送一次相关的动作消息.

A swipe is a discrete gesture, and thus the associated action message is sent only once per gesture.

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent*)event 

当我使用UISwipeGestureRecognizer时也不会被调用

also doesn't gets called when I use UISwipeGestureRecognizer

如何检测用户何时抬起手指?

How can I detect when the user lifts his finger?

推荐答案

我弄清楚了，实际上很简单，而不是使用UISwipeGestureRecognizer来检测滑动，而是我自己使用事件处理来检测到它

I figured it out, actually it was quite easy, instead of using UISwipeGestureRecognizer to detect swipes I detected it myself using event handling

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    UITouch *touch = [touches anyObject];
    self.initialPosition = [touch locationInView:self.view];

 }
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
     UITouch *touch = [touches anyObject];
     CGPoint movingPoint = [touch locationInView:self.view];
     CGFloat moveAmt = movingPoint.y - self.initialPosition.y;
     if (moveAmt < -(minimum_detect_distance)) {
       [self handleSwipeUp];
     } else if (moveAmt > minimum_detect_distance) {
       [self handleSwipeDown];
     }
  }
 -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
      [self reset];

  }
 -(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event{
     [self reset];
  }

我没有将UIGestureRecognizer子类化，而是仅在必需的视图控制器中进行事件处理，因为在重置方法中，我正在重置属于该视图控制器的一些变量，计数器和计时器.

I haven't subclassed UIGestureRecognizer but did the event handling in the required view controller only, as in reset method I am resetting few variable, counters and timers belonging to the view controller.

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