ios - 双击 UIButton

Question

如何识别 UIButton 上的双击？

Answer 1

为控件事件UIControlEventTouchDownRepeat添加一个target-action，只有当touch的tapCount为2时才做action。

objective-C :

[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，双击按钮是一种不寻常的手势。在 iPhone 操作系统上，双击主要用于可缩放 View 以放大/缩小焦点区域。如果您做出执行其他操作的手势，对用户来说可能不直观。

swift 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.
    }
}