A class must adopt the
UIAppearance protocol to allow appearance customization using the
- iOS 5.0+
- tvOS 9.0+
To participate in the appearance proxy API, tag appearance property accessor methods in your header with
Appearance property accessor methods must be of the form:
You may have no axes or as many as you like for any property.
The property type may be any standard iOS type:
UIOffset. Axis parameter values must be either
NSUInteger. UIKit throws an exception if other types are used in the axes.
UIBarButtonItem defines these methods: