Question

我尝试将导航控制器添加到标签栏控制器，但标签显示为黑色。

我的代码： AppDelegate.m

#import "SettingsNavigationControllerViewController.h"
#import "SettingsViewController.h"
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    UIViewController *viewController1, *viewController2, *viewController3;
    SettingsNavigationControllerViewController *viewController4;

    UINavigationController *navigationController = [UINavigationController alloc];

    viewController1 = [[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil];
    viewController2 = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];
    viewController3 = [[ShareViewController alloc] initWithNibName:@"ShareViewController" bundle:nil];

    SettingsViewController *settingViewController = [[SettingsViewController alloc] initWithNibName:@"SettingsViewController" bundle:nil];
    viewController4 = [[SettingsNavigationControllerViewController alloc] initWithRootViewController:settingViewController];

    self.tabBarController = [[UITabBarController alloc] init];
    self.tabBarController.viewControllers = @[viewController1, viewController2, viewController3, navigationController];
    self.window.rootViewController = self.tabBarController;

    [self.window makeKeyAndVisible];
    return YES;
}

提前谢谢

Answer 1

这是因为你添加了一个没有 RootViewController 的导航控制器，甚至没有初始化。这就是为什么视图显示为黑色。可能您想添加 viewController4 而不是 navigationController 。所以改变你的代码如下

self.tabBarController.viewControllers = @[viewController1, viewController2, viewController3, viewController4];

Answer 2

您需要先使用rootviewcontrollers创建导航控制器

 viewController1 = [[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil];
 UINavigationController *navigationController1 = [[UINavigationController alloc] initWithRootViewController:viewController1];


 viewController2 = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];
 UINavigationController *navigationController2 = [[UINavigationController alloc] initWithRootViewController:viewController2];

然后像这样实例化Tab Bar控制器

self.tabBarController = [[UITabBarController alloc] init];
self.tabBarController.viewControllers = [NSArray arrayWithObjects:navigationController1, navigationController2, nil];

Answer 3

首先创建导航控制器。

UINavigationController *nav1 = [[UINavigationController alloc] init];
    UIViewController *viewController1 = [[[FirstSteps alloc] initWithNibName:@"FirstView" bundle:nil] autorelease];
    nav1.viewControllers = [NSArray arrayWithObjects:viewController1, nil];


 UINavigationController *nav2 = [[UINavigationController alloc] init];
    UIViewController *viewController2 = [[[Profiles alloc] initWithNibName:@"SecondView" bundle:nil] autorelease];
    nav2.viewControllers = [NSArray arrayWithObjects:viewController2, nil];

然后像这样初始化你的标签栏控制器。

self.tabBarController = [[[UITabBarController alloc] init] autorelease];
    self.tabBarController.viewControllers = [NSArray arrayWithObjects:nav1,nav2 ,nil];

    self.window.rootViewController=self.tabBarController;

希望这会对你有所帮助。

Answer 4

嗨伙伴请访问以下链接以获取标签栏示例。

我认为这是一个很好的例子，对你有所帮助。

https://github.com/alikaragoz/AKTabBarController

您只需在appDelegate.m文件中设置控制器名称

将导航控制器放在标签栏控制器中

4 个答案: