The Button Bar is a view that represents a list of UIBarButtonItems as horizontally aligned buttons.
A Button Bar is similar in concept to a UIToolbar, but Button Bars are not a drop-in API replacement for UIToolbar. Button Bars are slightly more versatile in that one might use a Button Bar to create a Toolbar or a Navigation Bar (left/right button bars).
Button Bar supports a subset of UIBarButtonItem's properties. Learn more by reading the section on UIBarButtonItem properties.