Kuidas on rakendatud sõnumite töötlemise järjestus Responder Chain süsteemis?

Response Chain — is a mechanism in iOS that determines the sequence of objects capable of handling events (e.g., touches, key presses).

When an event occurs, it is passed to the first object in the chain (usually the first responder). If that object cannot handle the event, it is passed to the next object in the chain, and so on, until the event is handled or the chain ends.

The chain is built from UIResponder objects such as UIView, UIViewController, UIWindow, and UIApplication. Each object has a reference to the next responder (nextResponder).

Example:

• User taps a button (UIView)
• The button attempts to handle the event
• If it cannot, the event is passed to the controller (UIViewController)
• If the controller does not handle it, the event is passed to the window (UIWindow)
• If the window does not handle it, the event is passed to the application (UIApplication)

This allows flexible event handling and logic implementation at different interface levels.