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I am writing an iPhone application and I have finally decided to use RestKit as the framework for connecting to REST Services. The way I am thinking of building is to have the Controllers in my application be completely agnostic to RestKit. For eg. If I had a login screen, in the usual RestKit scenario (based on example programs as well as few blog entries created by the RestKit developers) you will have the controller implement the RKRequestDelegate protocol and use the RKClient to call the service in the Controller passing self ( the controller) as the delegate. I would like to hide that from the User developing the Controllers and views. What I am thinking of is the following. I will have a LoginService which will login the user. There will be protocol LoginServiceDelegate which has two methods for success and failure. And the Controller can implement the LoginServiceDelegate and call the login Method in LoginService and get a success or failure callback. However to do this,