iOS应用启动黑屏、UINavigationController、Nib、RootViewController

问题描述

我有以下应用，其 RootViewController 名为 TopicsViewController.

I've got the following app, whose RootViewController is named TopicsViewController.

当我运行它时，没有任何错误或中断，但屏幕是黑色.没有表，填充或空，只是一个黑屏.不确定发生了以下哪些情况:

When I run it, there aren't any errors or breaks but the screen is black. No table, populated or empty, just a black screen. Not sure which of the following is happening:

• 我的应用程序 didFinishLaunchingWithOptions 方法与在其中初始化的解析器有关吗?
• 这与我的 TopicsViewController 的 nib 文件有关吗?

• Is there something wrong with my application didFinishLaunchingWithOptions method in relation to a parser initlizing in it?
• Is it something to do with my nib file for the TopicsViewController?

如果需要，我可以从我的 TopicsViewController 类中显示更多代码.

I can show more code from my TopicsViewController class if needed.

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

***initializing code for parser which populates TopicsViewController (not shown to save space)*****

///////////////////////////////////////////
UIViewController *rootController =
[[TopicsViewController alloc]
 initWithNibName:@"TopicsViewController" bundle:nil];

navController = [[UINavigationController alloc]
                 initWithRootViewController:rootController];

self.window = [[UIWindow alloc]
               initWithFrame:[[UIScreen mainScreen] bounds]];
[self.window addSubview:navController.view];
[self.window makeKeyAndVisible];
return YES; 
}

推荐答案

代替:

[self.window addSubview:navController.view];

写:

self.window.rootViewController = self.navController;

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