The UIKit framework provides the core objects that you need to build apps for iOS and tvOS . You use these objects to display your content onscreen, to interact with that content, and to manage interactions with the system.
What is UIKit used for?
The UIKit framework provides the core objects that you need to build apps for iOS and tvOS . You use these objects to display your content onscreen, to interact with that content, and to manage interactions with the system.