Question

在我的应用程序中，我有4个标签，在第一个标签上：我有4个视图。在第二个视图中，有一个按钮将打开第三个选项卡视图。但我选择的标签索引是一个。我怎么能把它变成第三。

标签栏的代码在APPDelegate中，如下所示：

  - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 
     UINavigationController *nav1 = [[UINavigationController alloc] init];
         UIViewController *viewController1 = [[[CarAccidentAppViewController alloc]
     initWithNibName:@"CarAccidentAppViewController_iPhone" bundle:nil]
     autorelease];
        nav1.viewControllers = [NSArray arrayWithObjects:viewController1, nil];

         //for steps tab...

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

         //for profiles tab...

        UINavigationController *nav3 = [[UINavigationController alloc] init];
         UIViewController *viewController3 = [[[Profiles alloc] initWithNibName:@"Profiles" bundle:nil] autorelease];
         nav3.viewControllers = [NSArray arrayWithObjects:viewController3, nil];

         //for contact us tab...

        UINavigationController *nav4 = [[UINavigationController alloc] init];
        UIViewController *viewController4 = [[[ContactUs alloc] initWithNibName:@"ContactUs" bundle:nil] autorelease];
         nav4.viewControllers = [NSArray arrayWithObjects:viewController4, nil]; self.tabBarController = [[[UITabBarController alloc] init]
     autorelease];
         self.tabBarController.viewControllers = [NSArray arrayWithObjects:nav1,nav2,nav3,nav4 ,nil];

         self.window.rootViewController=self.tabBarController;
        [self.window makeKeyAndVisible];
         return YES; 

}

Answer 1

在应用程序中以编程方式切换标签的最简单方法是执行此操作..

[self.tabBarController setSelectedIndex:3];

我在我的一个应用中使用它，效果非常好。

血浆

Answer 2

在 Swift 2中，您只需致电：

    self.tabBarController?.selectedIndex = 0

Answer 3

按钮单击

[self.navigationController pushViewController:YourView animated:YES];
[self.tabBarController setSelectedIndex:index];

Answer 4

 self.tabBarController.selectedViewController=[self.tabBarController.viewControllers objectAtIndex:3];

试试这个。这对你有帮助。

按钮单击时更改选定的TabBar索引

4 个答案: