Listening for TabBar view change

Question

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 - is there an alternative to that?

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

See [this](https://stackoverflow.com/questions/33837475/detect-when-a-tab-bar-item-is-pressed) or [this](https://stackoverflow.com/a/47861294/3681880) — Suragch, Dec 18 '17 at 02:29

score 4 · Accepted Answer · answered Jun 17 '11 at 21:04

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

score 0 · Answer 2 · answered Jun 17 '11 at 21:05

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 {...}

Listening for TabBar view change

2 Answers2