[ SWIFT ] - UIKit framework

The UIKit framework

The application can create interface through three ways to use UIKit

1. In the user interface tool (interface Buidler) from the object repository drag a window, view or other object.
2. Use the code to create
3. Through inheritance UIView category or indirectly inherit from the UIView class to implement a custom user interface

Framework of organization chart: 
資料來源：https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIKit_Framework/