Uikit

Framework lightweight, modular front-end to developing app

Screenshots

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Hunter's comment

Uikit is the framework that is most often used when developing iOS applications. It defines the core component iOS applications, from the label and the button for the table views and navigation controller. And basic framework defining classes, protocols and functions for iOS and OS X development, exclusive UIKit framework directed iOS development.

Such a Foundation, UIKit defining classes, protocols, functions, data types, and constant. It also adds additional functionality for a variety of Foundation classes, such NSObject, NSString and NSValue, through the use of Objective-C categories.