Cocoa从AppDelegate快速加载ViewController和情节提要视图

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // 创建ViewController对象
    ViewController *viewController = [[ViewController alloc] init];
    
    // 设置为根视图控制器
    self.window.rootViewController = viewController;
    
    // 显示窗口
    [self.window makeKeyAndVisible];
    
    return YES;
}

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // 创建ViewController对象
    let viewController = ViewController()
    
    // 设置为根视图控制器
    self.window?.rootViewController = viewController
    
    // 显示窗口
    self.window?.makeKeyAndVisible()
    
    return true
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // 加载情节提要视图
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    
    // 获取根视图控制器
    UIViewController *rootViewController = [storyboard instantiateInitialViewController];
    
    // 设置为根视图控制器
    self.window.rootViewController = rootViewController;
    
    // 显示窗口
    [self.window makeKeyAndVisible];
    
    return YES;
}

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // 加载情节提要视图
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    
    // 获取根视图控制器
    let rootViewController = storyboard.instantiateInitialViewController()
    
    // 设置为根视图控制器
    self.window?.rootViewController = rootViewController
    
    // 显示窗口
    self.window?.makeKeyAndVisible()
    
    return true
}