ios - ios7中如何显示所有tabBar标题

Question

基本上我无法在运行我的应用程序时显示所有 tabBar 项目，只显示第一个 View Controller :

我实际上必须单击一个选项卡才能显示其项目:

这是我在 Appdelegate.m 中的代码:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Initialize window
    self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];

    // Set background colors for both NavBar and TabBar
    [[UINavigationBar appearance] setBarTintColor:[UIColor colorWithRed:0.157 green:0.718 blue:0.553 alpha:1]];
    [[UITabBar appearance] setBarTintColor:[UIColor colorWithRed:0.141 green:0.216 blue:0.263 alpha:1]];

    // Initialize your five tab controllers.  with each tab has its own navigation controller
    HomePageView *homePageView = [[HomePageView alloc]init];
    UINavigationController *nav1 = [[UINavigationController alloc]initWithRootViewController:homePageView];

    ProfileViewController *profileViewController=[[ProfileViewController alloc]init];
    UINavigationController *nav2 = [[UINavigationController alloc]initWithRootViewController:profileViewController];

    FeedViewController *feedViewController=[[FeedViewController alloc]init];
    UINavigationController *nav3 = [[UINavigationController alloc]initWithRootViewController:feedViewController];

    ListeningSessionViewController *listeningSessionViewController= [[ListeningSessionViewController alloc]init];
    UINavigationController *nav4 = [[UINavigationController alloc]initWithRootViewController:listeningSessionViewController];

    RecievedViewController *recievedViewController =[[RecievedViewController alloc]init];
    UINavigationController *nav5 = [[UINavigationController alloc]initWithRootViewController:recievedViewController];

    // initialize tabbarcontroller,set your viewcontrollers and change its color.
    self.tabC = [[UITabBarController alloc]init];
    NSArray* controllers = [NSArray arrayWithObjects: nav1,nav2,nav3,nav4,nav5, nil];
    [self.tabC setViewControllers: controllers animated:NO];
    [_window addSubview:self.tabC.view];

    // Show window
    [self.window makeKeyAndVisible];


    return YES;
}

Answer 1

我猜您是在 Controller 的 viewDidLoad 或 viewDidAppear 方法中设置标题。这是行不通的，因为虽然所有 Controller 都在应用程序委托(delegate)中实例化，但只有索引为 0 的 Controller 加载了 View ，因此不会为其他 Controller 运行 viewDidLoad。相反，您应该在应用程序委托(delegate)中的导航 Controller 上设置标题，

ProfileViewController *profileViewController=[[ProfileViewController alloc]init];
UINavigationController *nav2 = [[UINavigationController alloc]initWithRootViewController:profileViewController];
nav2.tabBarItem.title = @"Profile";