当用户停止触摸UIButton时检测到

Question

我有一个附加了UIPanGesture的UIButton。当用户按下UIButton时，我将事件Touch Down称为事件。我也想知道用户何时将其手指从按钮上抬起，然后可能会将其拖到屏幕上。我尝试过使用代表，如Touch Up Inside或Touch Drag Exit，但这些在UIButton被拖动后似乎不起作用...

Answer 1

只有在平移手势识别器开始时才会触发。如果用户仅点击按钮，它将不会触发。

-(void)setupGesture 
{ 
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(handlePan:)]; 
    [self.yourButton addGestureRecognizer:pan]; 
} 


-(IBAction)handlePan:(UIPanGestureRecognizer *)sender 
{ 
    switch (sender.state) { 
     case UIGestureRecognizerStateEnded: 
      //Should fire when the user lifts finger 
      break; 
     default: 
      break; 
    } 
}