XCode如何加载主故事板？ [英] How does XCode load the main storyboard?

问题描述

当我使用storyboard在XCode 4.6中创建一个新的单一视图应用程序时，我们可以看到main函数使用应用程序委托创建一个新的应用程序，如下所示：

When I create a new single view application in XCode 4.6 using storyboard, we can see that the main function creates a new application using the application delegate like this:

return UIApplicationMain(argc, argv, nil, NSStringFromClass([MyAppDelegate class]));

但是，如果我们查看MyAppDelegate.h和MyAppDelegate.m，代码中没有任何地方可以引用MainStoryboard.storyboard。这与非故事板版本不同，我们可以找到以编程方式加载nib文件的代码行。

However if we look at MyAppDelegate.h and MyAppDelegate.m, there is nowhere in the code that references MainStoryboard.storyboard. This differs from a non-storyboard version where we can find the line of code that loads the nib file programmatically.

所以我的问题是，故事板是如何加载的？ （我应该去哪里寻找它？）

So my question is, how does the storyboard get loaded? (where should I poke to find it?)

谢谢

推荐答案

查看项目的目标设置

注意主要故事板设置。

如果你想自己在代码中这样做，你会做类似的事情。

If you wanted to do this in code yourself, you would do something like.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{

   UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:[NSBundle mainBundle]];
   UIViewController *vc = [storyboard instantiateInitialViewController];

   // Set root view controller and make windows visible
   self.window.rootViewController = vc;
   [self.window makeKeyAndVisible];

   return YES;
}

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