ios - 如何检测 UISwipeGestureRecognizer 的结束？

Question

来自苹果文档

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

如何检测用户何时抬起手指？

Answer 1

我想通了，实际上这很容易，而不是使用 UISwipeGestureRecognizer 来检测滑动，我自己使用事件处理来检测它

-(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];
  }

我没有对 UIGestureRecognizer 进行子类化，但只在所需的 View Controller 中进行了事件处理，因为在重置方法中，我正在重置属于 View Controller 的几个变量、计数器和计时器。