is it possible to use api from an NSObject class vs a View Controller?

I want to create a file utility that isn't tied to a View Controller.  I have one connection to the API working in a View Controller, but I'd like to create a standard NSObject module and simply instantiate a connection to the Dropbox API and do all the file work from there.

It calls the app delegate but the API never calls back... 

Am I asking for too much to have just any Objective C program call on it's own?  (by the way I will move to swift once I'm done with this version)