以编程方式添加TabBarController

Question

我想以编程方式制作标签栏控制器和导航控制器。我的代码到目前为止工作，它在底部显示一个标签栏，但OptionViewController在第二个标签栏的按钮上没有说任何内容（没有标题）。有趣的是，当我点击按钮时没有任何东西，标题出现（他的观点也是如此），有人可以向我解释我做错了什么吗？我尝试使用以下代码：

- (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;
}

Answer 1

您需要设置UINavigationController的tabBarItem和标题，而不是其根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;
}

Answer 2

我使用UITabbarController为UIViewController创建了UINavigationController作为应用程序的rooview控制器。

这里还有一个例子： 我使用xibs作为View Controllers。

AppDelegate.m

我创建了一个方法名称：setupAppHome

#pragma mark - SETUP HOME
-(void) setupAppHome{
    NSLog(@"set up the nano home");

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    if (_chatViewController == nil) {
        _chatViewController = [[ChatViewController alloc] initWithNibName:@"ChatViewController" bundle:nil];
        chatNav = [[UINavigationController alloc] initWithRootViewController:_chatViewController];
        chatNav.tabBarItem.title=@"Chat";
        chatNav.tabBarItem.image=[UIImage imageNamed:@"chat_icon.png"];

    }
    if (_callController == nil) {
        _callController = [[CallViewController alloc] initWithNibName:@"CallViewController" bundle:nil];
        callNav = [[UINavigationController alloc] initWithRootViewController:_callController];
        callNav.tabBarItem.title=@"Call";
        callNav.tabBarItem.image=[UIImage imageNamed:@"call_icon.png"];

    }
    if (_contanctsController == nil) {
        _contanctsController = [[ContactsViewController alloc] initWithNibName:@"ContactsViewController" bundle:nil];
        conNav = [[UINavigationController alloc] initWithRootViewController:_contanctsController];
        conNav.tabBarItem.title=@"Contact";
        conNav.tabBarItem.image=[UIImage imageNamed:@"contact_icon.png"];

    }
    if (_settingController == nil) {
        _settingController = [[SettingViewController alloc] initWithNibName:@"SettingViewController" bundle:nil];
        settingNav = [[UINavigationController alloc] initWithRootViewController:_settingController];
        settingNav.tabBarItem.title=@"Setting";
        settingNav.tabBarItem.image=[UIImage imageNamed:@"setting_icon.png"];

    }

    self.tabController = [[UITabBarController alloc] init];

    NSMutableArray          *controllers = [[NSMutableArray alloc] initWithCapacity:4];
    [controllers addObject:chatNav];
    [controllers addObject:callNav];
    [controllers addObject:conNav];
    [controllers addObject:settingNav];


    self.tabController.viewControllers = controllers;//@[chatNav,callNav,conNav,settingNav];

    self.tabController.selectedIndex=0;



    [self.window setRootViewController:self.tabController];
    [self.window makeKeyAndVisible];


}

使用iOS 11在Xcode 9中发短信。

Answer 3

如果有人需要SWIFT版本。这对我有用。感谢@rckoenes提供的objC答案，我曾经将其翻译过来。

    window?.makeKeyAndVisible()

    let dvc = HomeViewController()
    let dvc_nc = UINavigationController(rootViewController: dvc)
        dvc_nc.tabBarItem.title = "Home"
        dvc_nc.tabBarItem.image = UIImage(named: "HomeIcon")
    controllers.append(dvc_nc)

    let ovc = ProfileViewController()
    let ovc_nc = UINavigationController(rootViewController: ovc)
        ovc_nc.tabBarItem.title = "Profile"
        ovc_nc.tabBarItem.image = UIImage(named: "ProfileIcon")
    controllers.append(ovc_nc)

    let tbc = UITabBarController()
        tbc.viewControllers = controllers

    window?.rootViewController = tbc

    UINavigationBar.appearance().tintColor = UIColor(red: 0.05, green: 0.47, blue: 0.91, alpha: 1.0)
    UINavigationBar.appearance().barTintColor = UIColor(red: 0.05, green: 0.47, blue: 0.91, alpha: 1.0)
    UINavigationBar.appearance().titleTextAttributes = [NSForegroundColorAttributeName: UIColor.whiteColor()]
    UIApplication.sharedApplication().statusBarStyle = UIStatusBarStyle.LightContent