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can't understand obviously. Why logic is incorrect?
The tabs are stored in an array named tabBarItems (line 9). Declare a UITabBarItem variable named tab and set it from tabBarItems. Use the selectedIndex we just set as the index for the tab you get from the tabBarItems array.
UITabBarItem *tab = tabBarItems.selectedIndex;
I got the point. I should write something like:
UITabBarItem *tab = tabBarItems;