...When the component is closed you can only see a central button (“+”). When tapping on it, our custom Tab Bar expands letting other tabBarItems appear, so that the user can switch the controllers. YALFoldingTabBarController is a subclass of UITabBarController with custom animating YALFoldingTabBar. Each separate tabBarItem can have two additional buttons on the left and right. These buttons can be used to let a user interact with a selected screen on the YALFoldingTabBarController without even having to leave it.