轻扫手势识别UISwipeGestureRecognizer

以下创建手势将会添加到gestureView上

//将view的背景颜色设置为白色
 self.view.backgroundColor = UIColor.white
        //创建一个UIView
 let gestureView = UIView(frame: CGRect(x: 0, y: 100, width: 
 308, height: 308))
 gestureView.backgroundColor = UIColor.green
 self.view.addSubview(gestureView)

创建轻扫手势

let swipe = UISwipeGestureRecognizer(target: self, action: #selector(swipeAction))

设置手势支持的轻扫方向，而且一个轻扫手势只能存储一个方向

swipe.direction = .right

let swipe2 = UISwipeGestureRecognizer(target: self, action: #selector(swipeAction))
        swipe.direction = .left

把轻扫手势添加到gestureView上

gestureView.addGestureRecognizer(swipe)
gestureView.addGestureRecognizer(swipe2)

实现轻扫手势关联方法swipeAction

//MARK:- 轻扫手势关联方法
    func swipeAction(sender:UISwipeGestureRecognizer){
        if sender.direction == .right{
            sender.view?.backgroundColor = backRandomColor()
        }
        else if sender.direction == .left {
            sender.view?.superview?.backgroundColor = backRandomColor()
        }
    }

定义一个backRandomColor方法用来随机变换背景颜色

 func backRandomColor()->UIColor {
        //产生0～1的随机数
        let redView = Float(arc4random_uniform(256))/255.0
        let greenView = Float(arc4random_uniform(256))/255.0
        let blueView = Float(arc4random_uniform(256))/255.0
        //产生随机颜色
        let color = UIColor(red: CGFloat(redView), green: CGFloat(greenView), blue: CGFloat(blueView), alpha: 1.0)
        return color
    }