Listening for TabBar view change

I need to know evertime a certain tab on my tabbar is selected to be able to set a certain BOOL. viewDidLoad does net get called every time/when I click on the tab - i开发者_如何学编程s there an alternative to that?

I need to know this in that tab's-view's viewcontroller.

You probably want one of these:

• The UITabBarDelegate method - (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item

• The UITabBarControllerDelegate method - (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController

The UITabBar does not load all the view controllers at once - it loads the first one. When you click on a tab bar button you load another controller.

To receive the changes in the tab bar you can add a delegate and implement:

-(void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item {...}