iOS应用程序启动黑屏，UINavigationController，Nib，RootViewController [英] iOS Application launch black screen, UINavigationController, Nib, RootViewController

问题描述

我有以下应用，其 RootViewController 被命名为 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。没有桌子，填充或空，只是黑屏。不确定发生了以下哪种情况：

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:

• 我的应用程序是否有问题 didFinishLaunchingWithOptions 与解析器初始化相关的方法？


• 是否与 TopicsViewController 的
  

• 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

而不是：

[self.window addSubview:navController.view];

写：

self.window.rootViewController = self.navController;

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