Answer Posted / Avnesh Kumar Gupta
A responder chain in Objective-C is a sequence of objects that are searched for a method implementation. When a message is sent to an object, the runtime begins searching for the method in the receiver. If it's not found, it looks in the receiver's superclass, then the superclass's superclass, and so on up the hierarchy until Objective-C finds the method or reaches NSObject. Responder chains are essential for event handling and delegate design pattern in Cocoa.
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