霓虹灯 swift代码

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

}