在iPhone中的标签栏控制器

我在我的应用程序中添加了两个选项卡，使用这些选项卡加载两个视图控制器

• Tab1：首页
• 表2：collections

所以我写下面的代码来实现这一点

在应用程序代表

AppDelegate.h

@class ViewController,FavViewController; @interface AppDelegate : UIResponder <UIApplicationDelegate> @property (strong, nonatomic) UIWindow *window; @property (strong, nonatomic) ViewController *viewController; @property (strong, nonatomic) FavViewController *favViewController; @property (strong, nonatomic) UITabBarController *tabBarController; @end 

AppDelegate.m

  @implementation AppDelegate @synthesize window = _window; @synthesize viewController; @synthesize favViewController; @synthesize tabBarController; - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; baseTabBarController = [[UITabBarController alloc]init]; baseTabBarController.delegate=self; viewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil]; UINavigationController *homeView = [[UINavigationController alloc]initWithRootViewController:viewController]; favViewController = [[FavViewController alloc] initWithNibName:@"FavViewController" bundle:nil]; favViewController.title = @"My Favourite"; UINavigationController *favouriteView = [[UINavigationController alloc] initWithRootViewController:favViewController]; NSArray *controllers = [NSArray arrayWithObjects:homeView,favouriteView, nil]; baseTabBarController.viewControllers = controllers; [self.window addSubview:baseTabBarController.view]; [self.window makeKeyAndVisible]; return YES; } - (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)selectedViewController { if (tabBarController.selectedIndex == 0) { }else if (tabBarController.selectedIndex == 1) { [(FavViewController *)[(UINavigationController*)selectedViewController topViewController] getData]; }else if (tabBarController.selectedIndex == 2) { NSLog(@"2"); } } 

这里是我得到的结果屏幕

所以我在这里遇到麻烦

如果我切换到下一个屏幕，我的第一个选项卡不会加载第一个屏幕（主屏幕），而只是停留在当前屏幕上。

让我试一试

在我的应用程序中有四个屏幕让我们说A，B，C，D

我为A和C屏幕添加了选项卡，这些选项卡可以在整个应用程序（全屏）中使用。

现在，如果我将启动应用程序，并进入A – > B-> C – > D并按Home Tab（A），它不会加载屏幕A，而是保持当前屏幕

但好东西是如果我做与另一个选项卡C（我最喜欢）相同的过程加载正确的屏幕。

编辑：我已经实施didSelectViewController方法@sanjitbuild议我，但我不能区分，这个时间点击哪个标签？

我会很感激！ 如果有人能指引我正确的方向

Answer 1

使用Tabbar委托并使用uiviewcontroller的参数实例调用poptorootviewcontroller方法。 希望它可以为你工作。 尝试下面的代码

 - (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController { UINavigationController *navController = (UINavigationController*)tabBarController.selectedViewController; [navController popToRootViewControllerAnimated:YES]; } 

Answer 2

replace代码

 [viewController setTabBarItem:tab1]; [favViewController setTabBarItem:tab2]; 

同

 [[tabbarController tabBar] setItems:[NSArray arrayWithObjects:tab1,tab2, nil]]; 

应该解决。

Answer 3

  Viewcontroller.h @property(nonatomic, retain) UITabBarItem *item1; @property(nonatomic, retain) UITabBarItem *item2; @property(nonatomic, retain) UITabBarItem *item3; @property(nonatomic, retain) UITabBarItem *item4; @property(nonatomic, retain) IBOutlet UITabBar *tabBar; Viewcontroller.m @synthesize item1,item2,item3,item4,tabBar; - (void)viewDidLoad { item1 = [[UITabBarItem alloc] initWithTitle:@"Home" image:[UIImage imageNamed:@"home.png"] tag:0]; item2 = [[UITabBarItem alloc] initWithTitle:@"My Lists" image:[UIImage imageNamed:@"mylist"] tag:1]; item3 = [[UITabBarItem alloc] initWithTitle:@"Search" image:[UIImage imageNamed:@"search.png"] tag:2]; item4 = [[UITabBarItem alloc] initWithTitle:@"Settings" image:[UIImage imageNamed:@"setting.png"] tag:3]; NSArray *items = [NSArray arrayWithObjects:item1,item2,item3,item4, nil]; [tabBar setItems:items animated:NO]; [tabBar setSelectedItem:[tabBar.items objectAtIndex:2]]; tabBar.delegate=self; [self.view addSubview:tabBar ]; } /****Function Call******/ - (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item { if(item.tag == 0) { Newsfeeds *obj = [[Newsfeeds alloc]initWithNibName:@"Newsfeeds" bundle:Nil]; [self.navigationController pushViewController:obj animated:NO]; } else if(item.tag == 1) { MyLists *obj = [[MyLists alloc]initWithNibName:@"MyLists" bundle:Nil]; [self.navigationController pushViewController:obj animated:NO]; } else if(item.tag == 3) { Settings *obj = [[Settings alloc]initWithNibName:@"Settings" bundle:Nil]; [self.navigationController pushViewController:obj animated:NO]; } }