7: Adding the Game Controller in Objective-C

Printer QR Code JIS X 0510 in Objective-C 7: Adding the Game Controller

CHAPTER 7: Adding the Game Controller
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Convert character received to a real number NSNumber *posInt = [[NSNumber alloc] initWithUnsignedChar:i]; put the number somewhere that we control appDelegate.paddlePosition = posInt; [[NSNotificationCenter defaultCenter] postNotificationName:@"POTTURNED" object:self]; [posInt release]; } }
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What you ve done is to use the appDelegate reference to get access to a global variable paddlePosition that you can set from the game controller object. You still use the notification system to alert the view controller that data is available, but you don t pass any data as userInfo dictionary parameter. NOTE: You don t have to use global variables if you re of the mindset that they are evil. Just as easily, you could put the information directly into parameters that the view controller has made public. While the notification is used to alert the view controller that a new position is available, you don t even have to do it this way. Remember that your game operates as a gameLoop that is called periodically by an NSTimer that you set up. All you really need to do is to update the position of the paddle using the variable that you set. The gameLoop, or its enclosing object the view controller, doesn t care that new data is available. It always uses the paddlePosition variable on each iteration through the gameLoop. This way you now completely control where your data from the accessory is used as well as reduced the latency of your system by eliminating the notification center for the more real-time aspect of your system the paddle updates. To access the game controller object, you need to create the sharedController method that returns the reference to the game controller singleton.
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+ (GameController *)sharedController { static GameController *accessoryController = nil; if (accessoryController == nil) { accessoryController = [[GameController alloc] init]; } return accessoryController; }
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Each time you call sharedController, you remove the reference to any preexisting game controller by setting it to nil. Then you alloc-init a new instance and return it to the caller.
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CHAPTER 7: Adding the Game Controller
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By making your game controller instance a static variable, even if you do call sharedController multiple times, you re always referencing the single instance. In your Pong game design, you chose to put the delegate methods for when an accessory is connected or disconnected in the view controller. I ll discuss changes to the view controller to accommodate the game controller accessory a bit later in this chapter, but for now I need to mention that when the controller is connected you need to set up your session. In the view controller s accessoryConnected method, you call the following game controller method:
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- (void)setupControllerForAccessory:(EAAccessory *)accessory withProtocolString:(NSString *)protocolString { [_accessory release]; _accessory = [accessory retain]; [_protocolString release]; _protocolString = [protocolString copy]; }
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What happens in setupControllerForAccessory is that you make sure to release any accessory instances that have been hanging around and retain the accessory that the caller has passed by incrementing its retain count by one. Similarly, you release any previous protocol strings that might be present setting your instance variable to the new string that the view controller has passed in. The final key elements of the game controller object are the methods to open and close the communications streams that is done via the open and close session methods. In the following openSession code, the first thing to happen is that you assign this object (self) as the delegate for the accessory instance _accessory that was just covered in the setup routine. Next, you open a session through the usual method of alloc-init, passing in the accessory instance and the protocol string.
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- (BOOL)openSession { [_accessory setDelegate:self]; _session = [[EASession alloc] initWithAccessory:_accessory forProtocol:_protocolString]; //_session = [[EASession alloc] initWithAccessory:_accessory forProtocol:@"COM.MACMEDX.P1"]; if (_session) { [[_session inputStream] setDelegate:self]; [[_session inputStream] scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; [[_session inputStream] open]; [[_session outputStream] setDelegate:self];
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