如何将UIButton带到TabBar的前面？

Question

I have a TabBar and I want to add UIButton on it, but it stays behind of tabBar:

Image( http://i.stack.imgur.com/RxGXb.png )

How can I bring it to front and make over the TabBar?

I've tried this one:

override func viewDidLayoutSubviews() {
    tabBarController?.tabBar.bringSubviewToFront(addButton)
}

but it doesn't help me

Answer 1

You can't easily. You could subclass the UITabBar class, but that would make you handle it yourself (without a UITabBarController):

Do not modify a tab bar that is managed by a tab bar controller (an instance of the UITabBarController class). If you do so, the system raises an exception. Modify a managed tab bar, or its items, only through the tab bar controller API.