app自定义 加载窗口与视图

app自定义 加载窗口与视图

 funcapplication(_application:UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey:Any]?) ->Bool{

       let window = UIWindow.init(frame: UIScreen.main.bounds)

       letnav =UINavigationController.init(rootViewController:ViewController.init())

        window.rootViewController= nav

        window.backgroundColor = UIColor.white

        window.makeKeyAndVisible()

        self.window= window

        return true

    }