有这样一种场景，当我们点击view的时候，需要过0.几秒显示一个灰色或者别的颜色的背景

用button来实现，只有按下去的时候才会出现，往往在快速按下，快速抬起的时候是看不出这个变化的

下边是解决方案

1 override func touchesBegan(touches: Set
     
      , withEvent event: UIEvent?) { 2          3         let touch = touches.first! 4         let p = touch.locationInView(self.retweetBackgroundView) 5         let insideRetweet = CGRectContainsPoint(self.retweetBackgroundView!.bounds ,p) 6          7         if self.retweetBackgroundView?.hidden == false && insideRetweet { 8              9             self.retweetBackgroundView!.performSelector("setBackgroundColor:", withObject: kWBCellHighlightColor, afterDelay: 0.15)10             self._touchRetweetView = true11         }else {12 13             self.contentView!.performSelector("setBackgroundColor:", withObject: kWBCellHighlightColor, afterDelay: 0.15)14             self._touchRetweetView = false15         }16 17     }18     19     override func touchesEnded(touches: Set
      
       , withEvent event: UIEvent?) {20         21         self.touchesRestoreBackgroundColor()22     }23     24     override func touchesCancelled(touches: Set
       
        ?, withEvent event: UIEvent?) {25         26         self.touchesRestoreBackgroundColor()27     }28     29     func touchesRestoreBackgroundColor() {30         NSObject.cancelPreviousPerformRequestsWithTarget(self.retweetBackgroundView!, selector: "setBackgroundColor:", object: kWBCellHighlightColor)31          NSObject.cancelPreviousPerformRequestsWithTarget(self.contentView!, selector: "setBackgroundColor:", object: kWBCellHighlightColor)32         self.retweetBackgroundView!.backgroundColor = UIColor.whiteColor()33         self.contentView.backgroundColor = kWBCellInnerViewColor34     }