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这是我的 AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    UINavigationController *navigationController = (UINavigationController *)self.window.rootViewController;
    EventsMasterViewController *firstViewController = (EventsMasterViewController *)[[navigationController viewControllers] objectAtIndex:0];

    self.window.rootViewController = navigationController;
    [self.window makeKeyAndVisible];

    EventDataController *_myEventsDataController = [[EventDataController alloc] init];
    firstViewController.myEventsDataController = _myEventsDataController;

    EventDataController *_upcomingEventsDataController = [[EventDataController alloc] init];
    firstViewController.upcomingEventsDataController = _upcomingEventsDataController;

    EventDataController *_bookmarkedEventsDataController = [[EventDataController alloc] init];
    firstViewController.bookmarkedEventsDataController = _bookmarkedEventsDataController;

    return YES;
}

当我唯一的视图是嵌入在导航控制器中的 MasterViewController 和 DetailViewController 时，这曾经很有效。

现在我想添加一个 TabBarController。所以我将 NavigationController 嵌入到 TabBarController 中。但是我的代表抛出了一个错误。

如图所示，我真的需要初始化我的 EventDataController 的 3 个实例。

所以我想问题是，“我如何以编程方式从 tabBarController 中获取 navigationController，以便我可以将 EventsDataControllers 添加到 firstViewController？”

更新

这是我的错误。我不明白 setMyEventsDataController 如何成为 UINavigationController 上的方法。

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UINavigationController setMyEventsDataController:]: unrecognized selector sent to instance
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2 回答 2

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The UITabBarController has to be the window's rootViewController. You then add each of the UINavigationBarControllers as the contentViews of the tab bar.

于 2012-08-10T18:55:26.907 回答
-1 
EventsMasterViewController *firstViewController = (EventsMasterViewController *)[[navigationController viewControllers] objectAtIndex:0];

Because you set the firstViewController to the nav controller itself.

于 2012-08-10T19:08:10.030 回答