UIBarButtonItem is a button specialized for placement on a UIToolbar or UINavigationBar object. It is inherited fromits abstract superclass, UIBarItem of Apple's UIKit framework. It is available in iOS 2.0 and later.The issues related with UIBarButtonItem question can be tagged with [UIButtonBarItem].
A UIBarButtonItem is an abstract object representing a button or custom view on a UIToolbar and UINavigationItem. The UIBarButtonItem defines additional initialization methods and properties for use on toolbars and navigation bars.
From Apple official documentation:UIBarButtonItem class reference You typically use Interface Builder to create and configure bar button items
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