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Asked: 2026-05-31T23:38:56+00:00

I think this should be simple, but im having a real hard time finding

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I think this should be simple, but im having a real hard time finding information about this topic. I have made a static library and have no problem getting the basics to work. But im having a hard time figuring out how to make a call back from the static library to the main APP.

I would like my static library to only use one header as front, this header should contain functions like:
requestImage:(NSString *)path;
requestLikstOfSomething:(NSSting *)guid;
and so on..

These functions should do the necessary work and start a async NSURLConnection, and call back to the main application when the call have finished. How do you guys do this, what are the best ways to callback from a static library when a async method is finished? should i do this with delegates (is this possible), notifications, key/value observers. I really want to know how you guys have solved this, and what you regard as the best practices.

Im going to have 20-25 different calls so i want the static library header file to be as simple as possible preferable only with a list of the 20-25 functions.

UPDATE:
My question is not how to use delegate pattern, but witch way is the best to do callbacks from static librarys. I would like to use delegates but i dont want to have 20-25 protocol declarations in the public header file. I would prefer to have only one function for each request.

Solution choosen:
i choose the solution from erkanyildiz with the help of a target parameter, i know its pretty low tech, but it was for me the cleanest solution. My goal was to keep the header file as small as possible. Thanks to everybody for they input, i will for sure look more into borrrdens solution with grand central dispatch when i get the time. user1055604 solution with a couple of “standard” delegates for replys is also one i like. So again thank you all for inputs.

Thanks in advance.
Best regards
Morten

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1 Answer

  1. Editorial Team

    Delegation pattern is a good way to do it.

    You can check these pages:

    http://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/CocoaFundamentals/CommunicatingWithObjects/CommunicateWithObjects.html#//apple_ref/doc/uid/TP40002974-CH7-SW18

    http://en.wikipedia.org/wiki/Delegation_pattern#Objective-C_example

    As another approach, you can use a target parameter in every method you have.
    And schedule callbacks on those targets, checking if they are responding to your callbacks using respondsToSelector

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