Web service controller design issue

I have various UIViewControllers that need data from we开发者_Python百科b services. Is it best to create separate controller classes which the UIViewController's in turn call or keep the code inside the UIViewController?

The reason I ask is because with delegation you kind of have to leave some of the connection code in the calling class in this case the UIViewController.

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I would create a new class which manages all interactions with your web services. This makes maintenance much more manageable and has better separation of responsibilities.