Disable action - user taps on tabbar item to go to root view controller
I want to disable the default action when user taps the tabbar item.
For example, i have a tabbar with Tab1, Tab2 and Tab3. In Tab1, user can navigate from View1 to View3 (View1 > View2 > View3). If user is at View3, and he taps the Tab1, the application takes the user to View1 (the root view controller)开发者_运维百科. I want to disable this functionality. I don't want the tap on Tab1 to pop all the view controllers. How can i do that?
Edit:
This behavior is a little strange, but a handy shortcut in case of deep hierarchy!
You can implement following UITabBarControllerDelegate methods to disable this system wide shortcut:
#pragma mark -
#pragma mark UITabBarControllerDelegate
- (BOOL)tabBarController:(UITabBarController *)tbc shouldSelectViewController:(UIViewController *)vc {
UIViewController *tbSelectedController = tbc.selectedViewController;
if ([tbSelectedController isEqual:vc]) {
return NO;
}
return YES;
}
if you look at the UITabBarController delegate there is a method:
- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController
If you implement this in your class, you can check if the UIViewController is the already displayed one and then return NO, which will stop this from happening.
I had the same problem with a ABPeoplePicker object embedded in a UITabBarController, in that pressing the 'Contacts' tab a second time which was already displayed would make the ABPeoplePicker control show the 'Groups'
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