霓虹燈的代碼
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.cyan
redView.tag = 200
self.window?.addSubview(redView)
redView.layer.cornerRadius = 100
let yelloeView = UIView(frame: CGRect(x: 132, y: 293, width: 150, height: 150))
yelloeView.backgroundColor = #colorLiteral(red: 1, green: 0.7380076051, blue: 0.8207985759, alpha: 1)
yelloeView.tag = 201
self.window?.addSubview(yelloeView)
yelloeView.layer.cornerRadius = 75
let blueView = UIView(frame: CGRect(x: 157, y: 318, width: 100, height: 100))
blueView.backgroundColor = #colorLiteral(red: 0.721568644, green: 0.8862745166, blue: 0.5921568871, alpha: 1)
blueView.tag = 202
self.window?.addSubview(blueView)
blueView.layer.cornerRadius = 50
let brownView = UIView(frame: CGRect(x: 182, y: 343, width: 50, height: 50))
brownView.backgroundColor = #colorLiteral(red: 0.9764705896, green: 0.850980401, blue: 0.5490196347, alpha: 1)
brownView.tag = 203
self.window?.addSubview(brownView)
brownView.layer.cornerRadius = 25
//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(duì)象? 參數(shù)3:目標(biāo)對(duì)象選擇執(zhí)行的方法? 參數(shù)四：用戶信息? 參數(shù)5：定時(shí)器是否重復(fù)執(zhí)行
Timer.scheduledTimer(timeInterval: 0.3, target: self, selector:#selector(changeColor) , userInfo: nil , repeats: true)
return true
}
//
func changeColor(){
let redView = self.window?.viewWithTag(200)
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 = self.window?.viewWithTag(203)?.backgroundColor
self.window?.viewWithTag(203)?.backgroundColor = color
}
