iPhone-每次我们从一个选项卡切换到另一个选项卡时如何获取主视图（第一视图）

Question

In my iPhone app, I have used tabbarcontroller in that i have 4 tabs for four different items

In each tab i have different views navigate transaction in those.

my requirement is, when i switch form on tab to another tab by taping on tabbar item .

T* the main view (first view ) of each tab has to be appeared instead of currently working view. *

For ex:

1. I select tab 3 there i do some operations and navigate to some 2nd view in the third tab.

2. and then i secet tab 4 and then again tab3.. then the previously woriking view view 2 presents in tab3,

   1. But i need to present 1st view at any time when i select tab 3 (Same like in any other tabs)

how to do..

Answer 1

Make a subclass of UINavigationController, change the class of any navigation controllers you have in your storyboard to that class, and put this code in that subclass:

-(void)viewDidDisappear:(BOOL)animated {
    [self popToRootViewControllerAnimated:NO];
}

Whenever you click on another tab, this method will be called, and it will reset the navigation stack back to the root view controller.

Answer 2

Set your view controller or appdelegate as delegate of your tabbarcontroller. implement this delegate function

- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController{
  int selectedIndex = tabBarController.selectedIndex;
  NSArray *tabbarControllers = tabBarController.viewControllers;

  //Then replace tabbarControllers[selectedIndex] by your new view controller(with navigation controller) 

   tabBarController.viewControllers = Your replaced Array;
}