代码中的 UITabBarController 不显示导航栏

Question

我们使用故事板在 Obj C 代码中创建了一个 UITabBarController。它工作正常，但是导航栏不显示在任何视图中。尝试在 TabBarController 和其他一些东西中创建导航栏。大多数示例不显示导航栏...任何具体的代码示例将不胜感激，谢谢！这是 VDL 代码：

- (void)viewDidLoad {
    [super viewDidLoad];

    UITabBarItem * startTab = [[UITabBarItem  alloc]initWithTitle:@"Home" image:[UIImage imageNamed:@"HomeTab.png"] tag:0]; 
     UITabBarItem * helpTab = [[UITabBarItem  alloc]initWithTitle:@"Help" image:[UIImage imageNamed:@"InfoDarkTab.png"] tag:1]; 

     UIStoryboard * phone = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle: nil];
     StartListTVC *startVC = [phone instantiateViewControllerWithIdentifier:@"StartList"];
     HelpWebVC * helpVC  = [phone instantiateViewControllerWithIdentifier:@"HelpWeb"];

     startVC.tabBarItem = startTab;
     helpVC.tabBarItem  = helpTab;

     NSArray *myViewControllers = [[NSArray alloc] initWithObjects:
         startVC,
         helpVC, nil];

    [self setViewControllers:myViewControllers];

    [self.navigationController setNavigationBarHidden:NO animated:NO];

    }

Answer 1

您应该将视图控制器嵌入到 UINavigationController 中，而不是 UITabBarController。

- (void)viewDidLoad {
    [super viewDidLoad];

    UITabBarItem * startTab = [[UITabBarItem  alloc]initWithTitle:@"Home" image:[UIImage imageNamed:@"HomeTab.png"] tag:0]; 
     UITabBarItem * helpTab = [[UITabBarItem  alloc]initWithTitle:@"Help" image:[UIImage imageNamed:@"InfoDarkTab.png"] tag:1]; 

     UIStoryboard * phone = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle: nil];
     StartListTVC *startVC = [phone instantiateViewControllerWithIdentifier:@"StartList"];
     HelpWebVC * helpVC  = [phone instantiateViewControllerWithIdentifier:@"HelpWeb"];


     UINavigationController *startNavVC = [[UINavigationController alloc] initWithRootViewController: startVC];
UINavigationController *helpNavVC = [[UINavigationController alloc] initWithRootViewController: helpVC];
     startNavVC.tabBarItem = startTab;
     helpNavVC.tabBarItem  = helpTab;
     NSArray *myViewControllers = [[NSArray alloc] initWithObjects:
         startNavVC,
         helpNavVC];

    [self setViewControllers:myViewControllers];
    }

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