Iphone 选项卡栏视图不加载

在我的应用程序代理界面中，我有：

@interface pivcalc1AppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
IBOutlet UITabBarController *RootController;

}
@property (nonatomic, retain) IBOutlet UIWindow *Window;
@property (nonatomic, retain) IBOutlet UITabBarController *RootController;

在我的主xib窗口中，我有一个选项卡栏控制器，它作为根控制器连接到app delegate。 当我运行程序时，窗口会显示，但不会加载选项卡栏视图。

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谢谢你的帮助。谢谢。

在xib的RootController中是否有子ViewController？如果你不是，那就是代码跟踪

UITabBarController应具有子视图控制器

    UINavigationController *localNavigationController;

    NSMutableArray *localViewControllerArray = [[NSMutableArray alloc] initWithCapacity:2];

    SubViewController *subviewController0 = [[SubViewController alloc] init];
    localNavigationController = [[UINavigationController alloc] initWithRootViewController:subviewController0];
    [localViewControllerArray addObject:localNavigationController];
    [subviewController0 release];
    [localNavigationController release];

    SubViewController *subviewController1 = [[SubViewController alloc] init];
    localNavigationController = [[UINavigationController alloc] initWithRootViewController:subviewController1];
    [localViewControllerArray addObject:localNavigationController];
    [subviewController1 release];

    [localNavigationController release];

    RootController.viewControllers = localViewControllerArray;
    [localViewControllerArray release];

    [self.window addSubview:tabBarController.view];
    [self.window makeKeyAndVisible];

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感谢您提供的解决方案。但我的问题是，我的选项卡栏项视图控制器nib名称有扩展名。我删除了扩展名“xib”，现在一切都很有魅力。

    UINavigationController *localNavigationController;

    NSMutableArray *localViewControllerArray = [[NSMutableArray alloc] initWithCapacity:2];

    SubViewController *subviewController0 = [[SubViewController alloc] init];
    localNavigationController = [[UINavigationController alloc] initWithRootViewController:subviewController0];
    [localViewControllerArray addObject:localNavigationController];
    [subviewController0 release];
    [localNavigationController release];

    SubViewController *subviewController1 = [[SubViewController alloc] init];
    localNavigationController = [[UINavigationController alloc] initWithRootViewController:subviewController1];
    [localViewControllerArray addObject:localNavigationController];
    [subviewController1 release];

    [localNavigationController release];

    RootController.viewControllers = localViewControllerArray;
    [localViewControllerArray release];

    [self.window addSubview:tabBarController.view];
    [self.window makeKeyAndVisible];