以编程方式调用委托中的故事板

我正在尝试以编程方式调用我的故事板。 我的故事板由以下内容组成：

[导航控制器] -> [MainMenuView] -> [DetailsView]

“MainMenu”标识符被放置在 [MainMenuView] 中

我遇到的问题是屏幕显示空白。我需要做什么？

Thanks.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{       
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];

    MainMenuView *rootViewController = [storyboard instantiateViewControllerWithIdentifier:@"MainMenu"];

    return YES
}

您需要首先手动创建窗口，然后在其中添加 rootViewController （之前的答案几乎是正确的）：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];

    UIViewController *mainViewController = [storyboard instantiateInitialViewController];

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.window.rootViewController = mainViewController;
    [self.window makeKeyAndVisible];

    return YES;
}