以编程方式添加TabBarController [英] Adding a TabBarController programmatically

问题描述

我想以编程方式制作一个标签栏控制器和导航控制器.我的代码到目前为止工作正常，以至于它在底部显示了一个标签栏，但是OptionViewController在第二个标签栏的按钮上什么也没说(没有标题).有趣的是，当我单击没有任何按钮的按钮时，标题就会出现(他的观点也是如此)，有人可以向我解释我做错了吗?我尝试使用以下代码:

I want to make a tab bar controller and navigation controller programmatically. My code works so far that it shows a tab bar at the bottom, but the OptionViewController doesn't say anything (no title) on the button of the second tab bar. The funny thing is, when i click the button without anything on it, the title appears (and so is his view), can someone explain to me what i am doing wrong? I tried to use the following code:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{    
    // Override point for customization after application launch.
    [self.window makeKeyAndVisible];

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

    DefaultViewController *dvc = [[DefaultViewController alloc] init];
    UINavigationController *dvc_nc = [[UINavigationController alloc] initWithRootViewController:dvc];
    [tabItems addObject:dvc_nc];
    [dvc release];
    [dvc_nc release];

    OptionsViewController *ovc = [[OptionsViewController alloc] initWithStyle:UITableViewStyleGrouped];
    UINavigationController *ovc_nc = [[UINavigationController alloc] initWithRootViewController:ovc];
    [tabItems addObject:ovc_nc];
    [ovc release];
    [ovc_nc release];

    UITabBarController *tbc = [[UITabBarController alloc] init];
    tbc.viewControllers = tabItems;
    self.tabController = tbc;
    [tabItems release];
    [tbc release];

    [self.window addSubview:self.tabController.view];

    return YES;
}

推荐答案

您需要设置UINavigationController的tabBarItem和标题，而不是其根viewController.

You need to set the tabBarItem and title of the UINavigationController and not its root viewController.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{    
    // Override point for customization after application launch.
    [self.window makeKeyAndVisible];

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

    DefaultViewController *dvc = [[DefaultViewController alloc] init];
    UINavigationController *dvc_nc = [[UINavigationController alloc] initWithRootViewController:dvc];
    dvc_nc.tabBarItem.title = @"Default";
    dvc_nc.tabBarItem.image = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"Default" ofType:@"png"]];
    [tabItems addObject:dvc_nc];
    [dvc release];
    [dvc_nc release];

    OptionsViewController *ovc = [[OptionsViewController alloc] initWithStyle:UITableViewStyleGrouped];
    UINavigationController *ovc_nc = [[UINavigationController alloc] initWithRootViewController:ovc];
    ovc_nc.tabBarItem.title = @"Option"
    ovc_nc.tabBarItem.image = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"Optiomn" ofType:@"png"]];

    [tabItems addObject:ovc_nc];
    [ovc release];
    [ovc_nc release];

    UITabBarController *tbc = [[UITabBarController alloc] init];
    tbc.viewControllers = tabItems;
    self.tabController = tbc;
    [tabItems release];
    [tbc release];

    [self.window addSubview:self.tabController.view];

    return YES;
}

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