ios開發新手入門-多視圖控制器管理

設定根視圖控制器

OC

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    //建立window 設定rootViewController ,顯示出來
    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    self.window = [[TestRootViewController alloc]init]; //設定根視圖控制器
    [self.window makeKeyWindow]; //設定成為主視窗并顯示
    return YES;
}
           

swift

let viewController = RootViewController()
        window = UIWindow.init(frame: UIScreen.main.bounds)
        window?.rootViewController = viewController

        window?.makeKeyAndVisible()