UIKit is the infrastructure framework on which all iOS user interface is built

https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIKit_Framework/

The UIKit framework (UIKit.framework) provides the crucial infrastructure needed to construct and manage iOS apps. This framework provides the window and view architecture needed to manage an app’s user interface, the event handling infrastructure needed to respond to user input, and the app model needed to drive the main run loop and interact with the system.

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