Скачать или смотреть Creating an iOS App using Protocol Delegate Design Pattern.

Delegate Design Pattern
is one of the most used patterns by Apple. It's like java interface where you have to implement functions in confirming classes.

In case you have class A and B. You want to update/communicate/signal class A from class B.

In this scenario A will be delegate of B.

We will create protocol and delegate functions in class B. And in case of some event triggered in B we will update class A. We should have protocol object which will be used to make contract.

Delegate class must implement all the functions of protocols.

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