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For example: Let's say I'm grabbing a list of names and saving it to an NSMutableArray. Do I implement the method of actually calling the server to fetch the data in the controller (UIViewController) or the model(Friends object)?
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First, the browser sends a request to the Controller. Then, the Controller interacts with the Model to send and receive data. The Controller then interacts with the View to render the data. The View is only concerned about how to present the information and not the final presentation.
The model is responsible for managing the data of the application. It receives user input from the controller. The view renders presentation of the model in a particular format. The controller responds to the user input and performs interactions on the data model objects.
The controller retrieves the data it needs from the model in order to respond to the request.
Stands for "Model-View-Controller." MVC is an application design model comprised of three interconnected parts. They include the model (data), the view (user interface), and the controller (processes that handle input). The MVC model or "pattern" is commonly used for developing modern user interfaces.
It's a design decision that depends on what you're trying to accomplish. If your model only makes sense in the context of a single service, or if you want your model to provide access to all the data on the server, then build the connection to the server into your data model. This might make sense if you are, for example, building a client for a service like Twitter or Flickr.
On the other hand, if you're just grabbing a file from a server and that's the end of it, it may make sense to do the communication in the controller. Controllers tend to be less reusable and more customized for the particular behavior of the application. Keeping the specifics about where the data comes from out of the model makes the model more reusable. It also makes it easy to test -- you can write test code that just reads a local file and stores the data in the model.
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