c# create barcode Figure 3 3. Game architecture using OOP and delegation in Objective-C

Painting Denso QR Bar Code in Objective-C Figure 3 3. Game architecture using OOP and delegation

Figure 3 3. Game architecture using OOP and delegation
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This program consists of the application delegate that handles all the method calls initiated by the sharedApplication. In general, this is mainly the notification that the application has finished launching.
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CHAPTER 3: EA Framework Design Patterns
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When the applicationDidFinishLaunching delegate method is called, the app delegate creates the root view controller, which in turn puts something to display onto the iPhone screen. You ve also added a game controller object and an accessory controller object. The game controller object represents the actual hardware controller accessory in your system. You don t do anything with the actual game controller; it s just a piece of hardware hanging off the iPhone. You could have left the block for it out of the illustration completely, but that might lead to some confusion as to where the sharedAccessoryController gets its information. This is where delegation becomes pretty clear. You have the actual controller object (the hardware) that communicates with the iPhone s OS and the sharedAccessoryController that gets created when you run your app. You created the Accessory delegate the part of the system that you program. Because you receive notifications from the sharedAccessory controller, you use your accessory controller delegate as the gateway to communicate with the actual game controller hardware. If you redraw Figure 3 3 as is shown in Figure 3 4 with the hardware now outside your system box, then everything within the dotted rectangle represents the system (program or app) that was created.
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Figure 3 4. Moving the physical controller outside the system box
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Figure 3 4 much more clearly delineates the parts of the system. The physical hardware connects through iPhone OS to the sharedAccessory controller once you create it.
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CHAPTER 3: EA Framework Design Patterns
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Similarly, the shared UIApplication singleton also exists outside your system boundary. Both of those shared controllers communicate with the code via delegation. The picture, however, is not complete. In addition to the Model-View-Controller (MVC) organization of the system that I will talk about next, the accessory controller delegate must pass data to and from the hardware accessory. While delegation does some of the work, specifically dealing with when an accessory is connected or disconnected, most of the heavy lifting (passing data back and forth) uses notifications. Notifications represent the final design pattern that I talk about in this chapter.
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Model-View-Controller
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As if things haven t gotten messy enough, now you come to the basic organizational structure of the app. Let s say this at the start; MVC represents a great way to partition your system. The thing is, for very small applications, it s not really needed, and, in fact, can complicate your project more than it needs to. So what is MVC Very simply, MVC divides your system into three parts: the view which is what the user sees, the model which represents all the data and states of your system, and the controller, in essence, the connection between the model and the view. Since you are operating within OOP, each of the elements the model, the view, and the controller are all objects. In addition to defining what roles the objects play, MVC also defines how the objects communicate. Figure 3 5 presents the basic view of MVC.
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Figure 3 5. Basic Model-View-Controller organization
As mentioned previously, the view is not just what the user sees, but the object with which he or she interacts. It contains the controls as well as all the images, labels, icons, and so forth. A user interacts with the view object not just by sight, but by touch (for control) as well as sound. Yes, as counter-intuitive as it might seem, sound emanates from the view object. Going to the other end, you see the model object contains the state of the system. In the Pong game, the model object knows the score, where the paddles and balls are, and so
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