Explain in which cases hit testing occurs in an interface or graphical application?

Hit Test is performed when a user interacts with the interface, for example, by tapping on the screen or clicking with a mouse. The system needs to determine which interface element is under the touch or click point.

In iOS, the Hit Testing process works as follows:

1. The system receives the touch coordinates.
2. It calls the hitTest(_:with:) method on the root UIView.
3. The method recursively checks child views, starting from the top of the hierarchy, to find the deepest view that contains the touch point and can respond to events.

Hit Test is important for handling touch events to correctly identify which element should receive the event (for example, a button press or a swipe in a list). Without proper Hit Testing, user input will not be processed correctly.