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27. Your First iOS Application > Model-View-Controller
Model-View-Controller, or MVC, is a design pattern that centers on the idea that any class that you create should fall into one of three job categories: model, view, or controller. Here’s a breakdown of the division of labor:
Models are responsible for storing data and making it available to other objects. Models have no knowledge of the user interface or how to draw themselves on the screen; their sole purpose is holding and managing data. NSString, NSDate, and NSArray are traditional model objects. In iTahDoodle, your one model object so far is the NSMutableArray where tasks are stored. However, each individual task will be described an instance of NSString, and these will also be model objects.
