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Though we ve talked about the Model-View-Controller (MVC) architectural pattern, you haven t yet put it to real use. To date, it s instead been a sort of abstract methodology for writing programs. But now that you re ready to use view controllers, you can start making use of MVC as a real-world ideal for programming. As you ll recall, under MVC, the model is your back-end data and the view is your front-end user interface. The controller is what sits in between, accepting user input and modifying both of the other entities. The view controller should take the role of the controller in the MVC, as the name suggests. We re going to get into this more in the next chapter, but we can say confidently that event and action control will happen through the view controller. We can say this confidently because we re pretty much going to be forced into using MVC. A view controller will automatically be set up to access and modify various elements of views that sit under it. For example, the view controller has a title property that is intended to be a human-readable name for the page it runs. In chapter 15, we ll learn that tab bars and navigation bars automatically pick up that information for their own use. In addition, we ll often see view controllers automatically linked up to delegate and datasource properties, so that they can respond to the appropriate protocols for their subviews. So, when you start seeing view controllers telling other objects what to do, look at it from the MVC lens. You should also think about MVC, yourself, as you start to program more complex projects using view controllers.

Alternately, you can use a more direct and simpler syntax based on the AddModelError methods:

If a view controller is going to act as a controller, it needs to have easy access to the objects that lay both above and below it in the view hierarchy. For this purpose, the view controller contains a number of properties that can be used to find other items that are connected to it. They re listed in table 13.2.

public void AddModelError(string key, string errorMessage); public void AddModelError(string key, Exception exception);

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Table 13.2 When you start connecting a view controller up to other things, you can use its properties to quickly access references to those other objects. Property Summary Reference to a temporary view controller, such as the Address Book and photo roll controllers that we discuss in chapter 16 and 18. Reference to a parent of the navigation controller type. Reference to the immediate parent view controller, or nil if there is no view controller nesting. Reference to a parent of the tab bar controller type. Reference to a tab bar item related to this particular view. Reference to the controller s managed view. The view s subviews property may be used to dig further down in the hierarchy.

These properties will primarily be useful when we move on to advanced view controllers, because they re more likely to link multiple view controllers together. We re mentioning them here because they re related to the idea of MVC and because they re UIViewController properties that will be inherited by all other types of controllers. For now, we re going to leave these MVC-related properties aside and get into some of the more practical things you can immediately do with a view controller, starting with managing view rotation.

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