https://developer.apple.com/library/mac/#documentation/General/Conceptual/DevPedia-CocoaCore/MVC.html
In the link above, I see the following regarding how the model layer should interact with the ViewController.
"When a model object changes (for example, new data is received over a network connection), it notifies the controller object, which updates the corresponding view objects.
My question is: how does the model object notify the Controller object? . How can this be done? My model layer gets the location of the user and then calls the web service. How should I notify the controller object when loading this data?
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