3: EA Framework Design Patterns in Objective-C

Create QR-Code in Objective-C 3: EA Framework Design Patterns

CHAPTER 3: EA Framework Design Patterns
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(the game program, controller, and iPhone) that contains properties and is capable of doing something can be considered an individually defined object. Figure 3 2 shows the game program s screen. Are these all the objects for the game No, of course not. Beside any consideration of the accessory game controller or the iPhone itself, you re missing state objects. State objects are those objects that represent something about the system that may or may not stand on its own. Weird sentence, huh But what I mean here is really the status of something, particularly the game itself. Is the ball on the player s side or the computer s side; whose turn is it to serve; are you at a game point; and various others. Why do you need to concern yourself with these particular state variables or state objects Again, you don t really, at least not these particular ones and not in all cases. More than likely, however, you will need some state information about the game that changes during the course of the game. It could be something as simple as an object that reflects whether a player can win on the next point or not. In such a case, you might provide a method for that object to take the individual players scores and compute YES or NO. The needs of the particular design will determine not only which state objects you need to create in your game object, but any tangible (ball, paddle, etc.) objects as well. In addition to all the objects that you create and can see, there is one more class that you must consider.
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Figure 3 2. Tangible game objects
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CHAPTER 3: EA Framework Design Patterns
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The UIApplication Class
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The one other issue to consider is the UIApplication Class. It s one of those things in iPhone programming that tends to hang around in the periphery and, as programmers, we avoid it for as long as we can. In general, through the use of delegation which I will talk about very soon, you can avoid dealing with the application class and where it fits into the big (or even the medium-sized) picture. Most of us understand that there is only one instance of the UIApplication class, possibly but usually not subclassed. But where does it come from I mean, I never created an object that subclassed UIApplication. And what does it do anyway Don t we already handle everything in the code that needs to be done Taking, the last question first: NO, not even close to it. The UIApplication handles all the routing of user events. When you touch the screen, for example, UIApplication deals with all of that. Normally, you have very standard things you want to do touch gestures, button presses, swipes, and so forth; UIApplication keeps you from dealing with those at the kind of low-level programming you would have needed to do a decade or so ago. UIApplication dispatches messages from control objects (UIControl) to the target objects responsible for implementing the results of those actions. UIApplication also knows about all the stuff going on in your app such as all the windows used; it keeps track of all open windows and, through those, any interactions with UIView objects. So where does it come from It s created for you anytime you use an XCode template. Look in the Other Sources folder and open the main.m file. In the good ol days, when we wrote programs in C, everyone had a main function. That s what gets called first anytime we wrote a C program. Same thing goes here. Just as in standard C, Objective-C doesn t really differ the main function is called first. Difference is, it doesn t do much. Take a look at the main.m file for the Pong game.
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#import <UIKit/UIKit.h> int main(int argc, char *argv[]) { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; int retVal = UIApplicationMain(argc, argv, nil, nil); [pool release]; return retVal; }
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If you ve written in standard C, you recognize the function declaration: main returns an int and is passed in (which would normally be by the command line when the program is called) two arguments. The first argument argc is a count of the parameters passed in, using the second argument, a character array argv[]. The header and the following four lines of code comprise the entire main function and are generated by XCode and you almost never change anything. I personally have never needed to change main.m.
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