ios 从 App Delegate 中的 Storyboard 获取初始视图控制器
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原文地址: http://stackoverflow.com/questions/13289158/
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Getting Initial View Controller from Storyboard inside the App Delegate
提问by Sebastian Boldt
I am trying to access the initial viewcontroller of my storyboard. It is a navigation controller which is wired up to a second viewcontroller via a seque. So after my application did finish launching I want to directly show the viewController that is connected through the segue. I tried it out with code like this but it doesn't work ...
我正在尝试访问我的故事板的初始视图控制器。它是一个导航控制器，通过序列连接到第二个视图控制器。所以在我的应用程序完成启动后，我想直接显示通过 segue 连接的 viewController。我用这样的代码试过了，但它不起作用......
UINavigationController *navController = (UINavigationController*)self.window.rootViewController;
[navController.topViewController performSegueWithIdentifier:@"showLoginScreen" sender:self];
What am I doing wrong?
我究竟做错了什么？
4 years later:
4年后：
If I look at my question again after 4 years, I honestly have no idea what my real problem was.
如果我在 4 年后再次看我的问题，老实说，我不知道我真正的问题是什么。
回答by AppleDelegate
Be sure you have tick marked the
确保您已勾选标记
is initial ViewController
是初始的 ViewController
option for UINavigationControllerin storyBoard
UINavigationController故事板中的选项
UIStoryboard* storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
UINavigationController * myStoryBoardInitialViewController = [storyboard instantiateInitialViewController];
回答by virtualnobi
Sebastian, I'm not sure why you would want to start the initial view controller manually - all my projects (which all use storyboards) do this automatically if you ticked "Use Storyboards" on the second screen in the "New Project" wizard.
塞巴斯蒂安，我不确定您为什么要手动启动初始视图控制器 - 如果您在“新建项目”向导的第二个屏幕上勾选“使用故事板”，我所有的项目（都使用故事板）会自动执行此操作。
Maybe you need to mark the storyboard scene as inital? This can be done in the scene's attribute inspector by ticking the "Is Initial View Controller" - rather obviously named.
也许您需要将故事板场景标记为初始？这可以在场景的属性检查器中通过勾选“是初始视图控制器”来完成 - 很明显地命名。
And then - if you really have a unusual setup which requires you to access the scenes manually, you can use the following:
然后 - 如果你真的有一个不寻常的设置，需要你手动访问场景，你可以使用以下内容：
UIStoryboard *sb = [UIStoryboard storyboardWithName: "StoryboardName"
bundle: [NSBundle mainBundle]];
UIViewController *vc = [sb instantiateInitialViewController];
(Beware - no code completion here, so check spelling again.)
（注意 - 这里没有代码完成，所以再次检查拼写。）
Or maybe I am getting your question completely wrong..? Happy hacking!
或者，也许我的问题完全错了..？快乐黑客！
回答by Pitono
In my app i have tabBar
在我的应用程序中，我有 tabBar
UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
TabBarController *tabBar = [storyBoard instantiateViewControllerWithIdentifier:@"TabBarController"];
_window.rootViewController = tabBar;
