UIResponder

UIResponder is a fundamental class in iOS development that manages how a device responds to user interactions, such as touches, gestures, and input events. Think of it as a responder that detects when you tap, swipe, or input on your screen and then handles these actions, often passing them along to other parts of the app. It forms the backbone of how user input is processed and directed within an app, enabling smooth and responsive interactions. UIResponder is the base class for objects like views and view controllers that deal with user events.