双击UIButton

Question

如何识别UIButton的双重触摸？

Answer 1

为控件事件UIControlEventTouchDownRepeat添加目标操作,并仅在touch tapCount为2 时执行操作.

Objective-C的:

[button addTarget:self action:@selector(multipleTap:withEvent:) 
             forControlEvents:UIControlEventTouchDownRepeat];

...

-(IBAction)multipleTap:(id)sender withEvent:(UIEvent*)event {
   UITouch* touch = [[event allTouches] anyObject];
   if (touch.tapCount == 2) {
     // do action.
   }
}

正如@Gavin评论的那样,双击一个按钮是一种不同寻常的姿态.在iPhone OS上,双击主要用于可缩放视图以放大/缩小焦点区域.如果您执行手势以执行其他操作,则对于用户可能不直观.

斯威夫特3:

button.addTarget(self, action: #selector(multipleTap(_:event:)), for: UIControlEvents.touchDownRepeat)

然后:

func multipleTap(_ sender: UIButton, event: UIEvent) {
    let touch: UITouch = event.allTouches!.first!
    if (touch.tapCount == 2) {
        // do action.
    }
}