import UIKit
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
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
import UIKit
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
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
func changValue(){
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 = color
}