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<UITouch>, 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 = true 11 }else { 12 13 self.contentView!.performSelector("setBackgroundColor:", withObject: kWBCellHighlightColor, afterDelay: 0.15) 14 self._touchRetweetView = false 15 } 16 17 } 18 19 override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) { 20 21 self.touchesRestoreBackgroundColor() 22 } 23 24 override func touchesCancelled(touches: Set<UITouch>?, 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 = kWBCellInnerViewColor 34 }