标签栏+导航栏

Question

我有两个选项卡栏，在第一个选项卡中，我可以向下钻取三个以上...但是在第二个选项卡中，我不能向下钻取多个。

代码：DemoAppdelegate.m

- (void)applicationDidFinishLaunching:(UIApplication *)application {
[window addSubview:tabBarController.view];
}

First tab controller is "FirstViewController"
in FirstViewController.m i have written to drill down to "billsummary.xib" 


DemoAppDelegate *app = (DemoAppDelegate *)[[UIApplication sharedApplication] delegate];
    UINavigationController *naviController = app.navigationController;
    BillsSummary *aViewAController = [[BillsSummary alloc] initWithNibName:@"BillsSummary" bundle:[NSBundle mainBundle]];

    [naviController pushViewController:aViewAController animated:YES];
    [aViewAController release];

which is working fine.But same code for in second tab for another .xib is not working and in second tab i have not used appdelegate instead i used "self.navigationcontroller"

UINavigationController *naviController = self.navigationController;
    PaymentsAmount *aViewAController = [[PaymentsAmount alloc] initWithNibName:@"PaymentsAmount" bundle:[NSBundle mainBundle]];

    [naviController pushViewController:aViewAController animated:YES];  
    [aViewAController release];

该怎么办？ 有什么帮助吗？

Answer 1

我不了解您的代码结构，但是通常可以通过以下方式解决该问题：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
   ...

   // Initialize UINavigationControllers and push first viewcontrollers for each one

   UIViewController *view1 = [[UIViewController alloc] init];
   UINavigationController *nav1 = [[UINavigationController alloc] initWithRootViewController:view1];
   [view1 release];

   // Same for the second NavigationController 

   ...      

   // Initialize UITabBarController
   UITabBarController tController = [[UITabBarController alloc] init];
   tController.viewControllers = [NSArray arrayWithObjects:nav1, nav2, nil];
   [nav1 release];
   [nav2 release];

   [window addSubview:tController.view];

   ...
}

Answer 2

请参考此处给出的答案。 那里也提供了教程链接。 祝你好运。

如何：选项卡栏控制器中的导航控制器

Answer 3

您的第二个代码片段位于哪个文件中？ 可能是self.navigationController没有引用您认为是的导航控制器。