iPhone Game Development

The App Delegate

One of the classes Xcode created for us was AppDelegate. This is the first piece of code that gets loaded when our program is run, and the last to unload. We are going to modify this class to inherit from GameStateManager because it is going to manage all of the important GameStates in our game. Like the other classes, GameStateManager.m and GameStateManager.h are located in the Classes subdirectory. Begin by modifying the Test_FrameworkAppDelegate class:

//Test_FrameworkAppDelegate.h
#include "GameStateManager.h"

@interface Test_FrameworkAppDelegate : GameStateManager <UIApplicationDelegate>

When our application starts up, the applicationDidFinishLaunching function is called on our AppDelegate to let us start initializing our game. We need to do two things here: start our main loop code and create an instance of our first GameState.

Add the following code to your AppDelegate class (don’t forget to add the appropriate header functions):

//Test_FrameworkAppDelegate.m #include "Test_FrameworkAppDelegate.h" - (void) applicationDidFinishLaunching:(UIApplication *)application { //set up main loop [NSTimer scheduledTimerWithTimeInterval:0.033 target:self selector:@selector(gameLoop:) userInfo:nil repeats:NO]; //create instance of the first GameState [self doStateChange:[gsMain class]]; } - (void) gameLoop: (id) sender { [((GameState*)viewController.view) Update]; [((GameState*)viewController.view) Render]; [NSTimer scheduledTimerWithTimeInterval:0.033 target:self selector:@selector(gameLoop:) ...