前言

　　UIView 不像 UIButton 加了點擊事件就會有點擊效果，體驗要差不少，這裡分別通過自定義和擴展來實現類似 UIButton 的效果。

正文

　　一、為 UIView 添加點擊事件

extension UIView {

  func addOnClickListener(target: AnyObject, action: Selector) {
    let gr = UITapGestureRecognizer(target: target, action: action)
    gr.numberOfTapsRequired = 1
    userInteractionEnabled = true
    addGestureRecognizer(gr)
  }

}

        二、為 UIView 添加點擊效果

class UIViewEffect : UIView {

  override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
    backgroundColor = UIColor.groupTableViewBackgroundColor()
  }

  override func touchesCancelled(touches: Set<UITouch>?, withEvent event: UIEvent?) {
    UIView.animateWithDuration(0.15, animations: { () -> Void in
      self.backgroundColor = UIColor.clearColor()
    })
  }

  override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
    UIView.animateWithDuration(0.15, animations: { () -> Void in
      self.backgroundColor = UIColor.clearColor()
    })
  }
}

 這裡大家可以換成自己的點擊效果，如果是 UIImageView 可以換成點擊變更透明度。