NavigationBar不顯示TTithumbsViewController在UITabBarController

Question

我試圖把一個TTThumbsViewController裏面的UITabBarController，但是當我這樣做時，TTThumbsViewController的NavigationBar不顯示。 NavigationBar應該只有空白區域。我已經自己加載了TTThumbsViewController，並且NavigationBar加載得很好。我確定我剛剛錯過了一個設置，但我無法弄清楚它是什麼。

下面是我在做什麼創造的UITabBarController和TTThumbsViewController：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 
    self.tabBarController = [[UITabBarController alloc] init]; 
    ThumbsViewController *thumbsViewController = [[ThumbsViewController alloc] init]; 
    UITabBarItem *thumbsTabBarItem = [[UITabBarItem alloc] initWithTitle:@"Thumbs" image:[UIImage imageNamed:@"icon.png"] tag:Thumbs]; 
    thumbsViewController.tabBarItem = thumbsTabBarItem; 
    self.tabBarController.viewControllers = [NSArray arrayWithObjects:thumbsViewController, nil]; 
    self.window.rootViewController = self.tabBarController; 
    [self.window makeKeyAndVisible]; 
    return YES; 
} 

Answer 1

如果你從一個UITabController加載TTThumbsViewController，你需要創建的UINavigationController自己。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 
    self.tabBarController = [[UITabBarController alloc] init]; 
    ThumbsViewController *thumbsViewController = [[ThumbsViewController alloc] init]; 
    UITabBarItem *thumbsTabBarItem = [[UITabBarItem alloc] initWithTitle:@"Thumbs" image:[UIImage imageNamed:@"icon.png"] tag:Thumbs]; 
    thumbsViewController.tabBarItem = thumbsTabBarItem; 

    UINavigationController *navController = [[[UINavigationController alloc] initWithRootViewController:ThumbsViewController] autorelease]; 

    self.tabBarController.viewControllers = [NSArray arrayWithObjects:navController, nil]; 
    self.window.rootViewController = self.tabBarController; 
    [self.window makeKeyAndVisible]; 
    return YES; 
}