Working with views
Along your path of UI enlightenment, you'll encounter different types of views. You can simplify the categorization by thinking about a view as the atomic element of the user interface, where a view has its own specific properties and can be grouped with other views to create complex hierarchies.
UIView is the base class used to instantiate generic views and it can be subclassed to create custom views. Almost all the UI elements that you will use in your applications are inherited from this class, and in the next chapter, you'll learn a lot about some of the elements provided by Apple within the UIKit framework.
Note
Keep in mind that the UIWindow class too is a subclass of UIView. This is generally a cause of confusion considering ...
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