触摸UIImageView的触摸和触摸操作 [英] Touch up and Touch down action for UIImageView

问题描述

我想要实现的是当用户触摸UIImageView设置Image1时，当用户抬起他的手指设置Image2时。

what i want to achieve is when user touch on UIImageView set Image1, when user lifts his finger set Image2.

我只能使用此代码获取UIGestureRecognizerState.Ended

i can only get UIGestureRecognizerState.Ended with this code

 var tap = UITapGestureRecognizer(target: self, action: Selector("tappedMe:"))     

        imageView.addGestureRecognizer(tap)
        imageView.userInteractionEnabled = true

func tappedMe(gesture: UITapGestureRecognizer)
{

    if gesture.state == UIGestureRecognizerState.Began{
        imageView.image=originalImage
        dbgView.text="Began"
    }else if  gesture.state == UIGestureRecognizerState.Ended{
        imageView.image=filteredImage
        dbgView.text="Ended"
    }else if  gesture.state == UIGestureRecognizerState.Cancelled{
        imageView.image=filteredImage
        dbgView.text="Cancelled"
    }else if  gesture.state == UIGestureRecognizerState.Changed{
        imageView.image=filteredImage
        dbgView.text="Changed"
    }

}

推荐答案

以下是解决方案：

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
   if let touch = touches.first {
      if touch.view == imageView {
         //began
      }
   }
   super.touchesBegan(touches, withEvent:event)
}
override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
   if let touch = touches.first{
      if touch.view == imageView {
         //end
      }
   }
   super.touchesEnded(touches, withEvent: event)
}

注意：将此放入UIView SubClass并在init块中添加： userInteractionEnabled = true

Note: Put this inside a UIView SubClass and add: userInteractionEnabled = true inside the init block

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