UIView
import UIKit
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
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: 20))
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)
// Override point for customization after application launch.
return true
}
//MARK 定制器找的目标对象执行的方法
func changeColor(){
let redView = self.window?.viewWithTag(200)
//存储redciew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
}
func applicationWillResignActive(_ application: UIApplication) {
// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
// Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
}
func applicationDidEnterBackground(_ application: UIApplication) {
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}
func applicationWillEnterForeground(_ application: UIApplication) {
// Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
}
func applicationDidBecomeActive(_ application: UIApplication) {
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}
func applicationWillTerminate(_ application: UIApplication) {
// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}
}