self.window = UIWindow(frame:UIScreen.main.bounds)
self.window?.backgroundColor = UIColor.white
self.window?.makeKeyAndVisible()
self.window?.rootViewController = UIViewController()
let redView = UIView(frame:CGRect(x: 107, y: 268, width: 200, height: 200))
redView.tag = 200
redView.backgroundColor = UIColor.red
self.window?.addSubview(redView)
redView.layer.cornerRadius = 100
let yellowView = UIView(frame:CGRect(x: 132, y: 293, width: 150, height: 150))
yellowView.tag = 201
yellowView.backgroundColor = UIColor.yellow
self.window?.addSubview(yellowView)
yellowView.layer.cornerRadius = 75
let blueView = UIView(frame:CGRect(x: 157, y: 318, width: 100, height: 100))
blueView.tag = 202
blueView.backgroundColor = UIColor.blue
self.window?.addSubview(blueView)
blueView.layer.cornerRadius = 50
//定时器 参数1：定时执行的间隔
//参数2：目标对象
//参数3：目标对象选择执行的方法
//参数4：用户信息 nil
//参数5：定时器是否重复执行
Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(changValue), userInfo: nil, repeats: true)
return true
}
//mark:定时器目标找的对象执行方法
func changValue(){
let redView = self.window?.viewWithTag(200)
//存储redView背景颜色
let color = redView?.backgroundColor
self.window?.viewWithTag(200)?.backgroundColor = self.window?.viewWithTag(201)?.backgroundColor
self.window?.viewWithTag(201)?.backgroundColor = self.window?.viewWithTag(202)?.backgroundColor
self.window?.viewWithTag(202)?.backgroundColor = color
}
