共享按钮作为 UITabBarController 上的标签栏项目，没有关联的控制器

Question

I have a UITabBarController with five tab bar items, one of them is share button action (to share the itunes store link - tell a friend). My issue is when I click on this tab, the UIActivityViewController has displayed with blank controller, I need to show the share window (UIActivityViewController) to appear above the last tab bar view selected to avoid the blank view of this tab bar item.

Answer 1

You can implement the UITabBarControllerDelegate protocol and use the - tabBarController:shouldSelectViewController: method to intercept the tap on the share tab like this:

- (BOOL) tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController {
    if (viewController == [tabBarController.viewControllers objectAtIndex:/*share button index*/]){
        //show UIActivityViewController
        return NO;
    }
    return YES;
}