With this chapter, you learned some of the very important basics that allow you to understand how UI elements are created, presented, and managed by the system. All these notions are essential to build simple and complex user interfaces, and they define a helpful starting point to easily read and appreciate the rest of this book.
The next chapter introduces the UIKit framework, an important set of classes that you will use in your everyday work. UIKit defines all the prebuilt UI elements of iOS and other classes that are fundamental to creating a complete and interactive layout.
