func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
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.backgroundColor = UIColor.red
redView.tag = 200
self.window?.addSubview(redView)
redView.layer.cornerRadius = 100
let yellowView = UIView(frame: CGRect(x: 132, y: 293, width: 150, height: 150))
yellowView.backgroundColor = UIColor.yellow
yellowView.tag = 201
self.window?.addSubview(yellowView)
yellowView.layer.cornerRadius = 75
let blueView = UIView(frame:CGRect(x: 157, y: 318, width: 100, height: 100))
blueView.backgroundColor = UIColor.blue
self.window?.addSubview(blueView)
blueView.tag = 202
blueView.layer.cornerRadius = 50
// 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: 0.3, target: self, selector: #selector(changeColor), userInfo: nil, repeats: true)
return true
}
// MARK:- 定制器找的目标对象执行方法
func changeColor() {
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
}
