Which class in iOS is responsible for handling interface events and implements UIResponder?

In iOS, the UIResponder class is the base class for handling interface events such as touches, key presses, and other events. It implements the responder chain, allowing objects to respond to events or pass them along.

Specifically, classes like UIView, UIViewController, and UIApplication inherit from UIResponder and implement user event handling.

Thus, UIResponder is the main class responsible for handling interface events in iOS.