RKTabView provides the opportunity to create toolbars with customizable behavior, functions and appearance. Standard iOS components such as UITabBar or UIToolbar sometimes are not customizable as needed and always behave in a certain way. Unlike them, this component can be installed anywhere, anytime, but the most important thing - all elements appearance and behavior can differ. Imagine, that part of bar should work as UITabBar(one is on - others are off), elements of second part should work as switchers(any element can be turned on or off independently), third part - ordinary buttons. All this can be done with RKTabView. Create elements of 3 types: * Excludable element(Same as UITabBar elemets. One is on - others are off) * Unexludable element (can be turned on or off independently) * Button element (work as ordinary button) To do this, use one of 3 initialization methods. Initialization method require element images for "enabled" and "disabled" states. "Button element" initialization method requires target and selector in addition.