My UITabBarControllercontains over 16 controllers. When I go to the Advanced tab, I see everything UITabBarItems. If I click the "Change" button, I will see the first 16 icons, but there is not enough space to display more, so starting from the 17th item, the icons are only partially displayed. Starting from the 21st item, the icons are not displayed at all. And access to other icons using the scroll bar is not available.
By the way, this question gives a theoretical answer to my question, but does not consider this practical corner case.
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