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Updated 25 August 2017
when we need to call any request to the network we most probably use delegate methods to send data and get a response when you only need to call a single function we will create for them an interface (Protocol in swift) which is not a good programming practice. So if you need to call a single you must use the callbacks in swift if you need to implement more than one function and also want that these all functions are to be implemented in your class you can use delegates. Here is the steps to create the callback in swift:-
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