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Mark_CoFlag for United States of America

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need help understanding delegates and delegation in iOS

I have been reading through the Big Nerd Ranch book and in chapter 4, on delegation, I have gone through and read it and done the coding but I still don't understand what delegates are.

Can someone help me understand delegation and its purpose and why I need to know it? What are the consequences of not knowing it? Thanks
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pgnatyuk
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Thanks