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.