Delegates - Functionality [duplicate]

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Delegates开发者_如何学运维, can't get my head around them

I am new to iPhone development, just started learning on my own.

While proceding i came up with a word Delegate. Can any one please explain them to me with an example.

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Delegates in ObjektiveC are objects with a specific set of methods, which are called by the delegate-using object when something happens. This way, you can avoid subclassing the main object in order to track some state changes.

Wikipedia has something about that