UIView and UIViewController

Welcome to building iOS interfaces! Every visual element you see in an iOS app, from buttons to entire screens, is built using two core components: UIView and UIViewController.

These are the fundamental building blocks that allow you to display content and manage user interactions in your Objective-C applications.

A UIView is the basic rectangular region that draws content and handles events on the screen. Think of it as a canvas where you can draw shapes, display text, or show images.

• It's the base class for all visual elements.
• It defines the content's position, size, and appearance.
• It can contain other views, creating a view hierarchy.