以编程方式在委托中调用故事板

Question

我试图以编程方式调用故事板。 我的故事板由以下部分组成：

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

的 “MainMenu的” 识别符被安排在[MainMenuView]

问题我”屏幕显示空白。我需要做什么？

谢谢。

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

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

    return YES 
} 

Answer 1

您需要将您的应用程序的窗口RootViewController的属性：

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

    self.window.rootViewController = rootViewController; 

    return YES; 
} 

Answer 2

您需要先手动创建的窗口，然后添加RootViewController的在它（以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; 
}