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10.4.3 Event response The next-to-last category of methods that we ll examine for the iPhone OS is event response. Unlike with object creation and memory management, we ll only tackle this issue briefly, because it s much better documented in chapter 14. The topic is important enough that we want to offer a quick overview of it now. There are three main ways that events can appear on the iPhone: through bare events (or actions), through delegated events, or through notification. Whereas the methods of our earlier topics all derived from NSObject, iPhone event response instead comes from the UIResponder object, while iPhone notification comes from the NSNotificationCenter. You won t have to worry about accessing responder methods and properties as UIResponder is the parent of most UIKit objects, but the NSNotificationCenter will require special access.

container.RegisterType<IActionInvoker, MyActionInvoker>();

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Most user input on the iPhone results in an event being placed into a responder chain. This is a linked set of objects that, for the most part, goes backward up through the view hierarchy. Any input is captured by the first responder, which tends to be the object that the user is directly interacting with. If that object can t resolve the input, it sends it up to its superview (e.g., a label might send it up to its full-screen view), then to its superview, all the way up the chain (e.g., up through the views, then up through the view controllers). If input gets all the way up the view hierarchy to the window object, it s next sent on to the application itself, which tends to pass it off to an application delegate as a last resort. Any of these objects could choose to handle an event, which stops its movement up the responder chain. Following the standard MVC model, you ll often be building

The customization of the action invoker component is an important aspect of the extensibility model of ASP.NET MVC. I ll return to the topic of action invokers in 11.

event response into UIViewControllers objects, which are pretty far up the responder chain. For any UIControl objects, such as buttons, sliders, and toggles, events are often turned into actions. Whereas events report touches to the screen, actions instead report manipulations of the controls and are thus easier to read. Actions follow a slightly different hierarchy of response.

There s another way that events can be sent to an object other than first responder: through a delegate. This is an object (usually a view controller) that says that it s going to take care of events for another object (usually a view). It s a close kin to a data source, which is an object (again, usually a view controller) that promises to do the data setup and control for another object (again, usually a view). Delegation and data sourcing are each controlled by a protocol, which is a set of methods that the delegate or data source agrees to respond to. For example, a table s delegate might have to respond to a method that alerts it when a row in the table has been selected. Similarly, a table s data source might describe what all the rows of the table look like. Delegates and data sources fit cleanly into the MVC model used by Objective-C, as they allow a view to hand off its work to its controller without having to worry about where each of those objects is in the responder chain.

Summary

Standard event response and delegation represent two ways that objects can be alerted to standard events, such as fingers touching the screen. There s also a third method that can be used to program many different sorts of activities, such as an iPhone s orientation changing or a network connection closing: the notification. Objects register to receive a certain type of notification with the NSNotificationCenter, and afterward may process those notifications accordingly. Again, we ll discuss this topic in chapter 14.

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