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
//定時(shí)器 參數(shù)1：定時(shí)執(zhí)行的間隔
//參數(shù)2：目標(biāo)對象
//參數(shù)3：目標(biāo)對象選擇執(zhí)行的方法
//參數(shù)4：用戶信息 nil
//參數(shù)5：定時(shí)器是否重復(fù)執(zhí)行
Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(changValue), userInfo: nil, repeats: true)
return true
}
//mark:定時(shí)器目標(biāo)找的對象執(zhí)行方法
func changValue(){
let redView = self.window?.viewWithTag(200)
//存儲redView背景顏色
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
}
