使用Storyboard的UITabBarController自定义操作

Question

I would like to prompt a user to sign in with a UIAlertView when the user presses a certain tab bar item in a tab bar controller.

This tab bar controller exists in storyboard, and as a result I'm not sure where i can do this. Apple claims that UITabBarController shouldn't be subclassed, further adding to my confusion. And furthermore, i am aware of UITabBarController's delegate pattern but i don't know what view controller i can hook it up to Note: My UITabBarController is generated from a modal segue from a UIViewController.

Thank you in advance.

Answer 1

I found the answer to this when answering another of my own questions, here.

I used the uitabbarcontrollerdelegate and set that in the root controller.

Answer 2

You can display your alert view when the selected view controller is displayed... Say you have a LoginViewController in the tab bar. inside that class create a method

- (void)viewDidAppear:(BOOL)animated;

which displays the alert view

Also look at the UITabBarDelegate

- (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item;