How to launch a cocos2D game from single view app - iphone

Question

I created a regular simple iOS app (a single view application) with one button and I want to launch a cocos2D game from the iOS app. In other words, I want to launch the cocos2D game when I press on the button from my myapp.xib. I don't want to use URL schemes to launch the game because that will require the user to download my app as well as download the game. I want the user to be able to launch the game from my app internally. This is the game I want to launch from my app:
http://www.raywenderlich.com/14439/how-to-make-a-game-like-fruit-ninja-with-box2d-and-cocos2d-part-3
I was able to successfully add this game as a dependency in my xcode project. However, I'm not sure how to go about launching the game from app.
Here's some ideas that I had, but they didn't really work for me.
Is there any way I can:
Call the app delegate of the game (not the app delegate of my app) from the IBAction in my app to launch the game?
Call the didFinishLaunchingWithOptions method of the game (not the didFinishLaunchingWithOptions of my app) from the IBAction in my app to launch the game?
Call the main.m file of the game (not the main.m of my app) from the IBAction in my app to launch the game?
From what I understand, these are three different ways of launching an iOS app. Keep in mind that I am developing an app (not a game) that will allow a user to launch the game above internally through the app. Ideally, it would nice (and also easy) if I can simply do a pushviewcontroller from my app to the game, but I'm not sure if there is an easy way to approach this.
Is there anyway I can launch this game internally through my app? Any advice, suggestions, sample source code would be greatly appreciated.

Answer 1

Short answer: YES
You would need to have just one AppDelegate (the one of your iOS app), and move there all the cocos2D init stuff. Then, you can launch the game from your IBAction with something like this.-
CCDirector *director = [CCDirector sharedDirector];
[director pushScene:[YourFirstGameScene node]];
[director resume];
[self presentModalViewController:director animated:YES];
Please, take next snippet as an example to init/end cocos2d from your appDelegate
- (void) initCocos {
// Create an CCGLView with a RGB565 color buffer, and a depth buffer of 0-bits
CCGLView *glView = [CCGLView viewWithFrame:[self.window bounds]
pixelFormat:kEAGLColorFormatRGBA8 //kEAGLColorFormatRGBA8
depthFormat:0 //GL_DEPTH_COMPONENT24_OES
preserveBackbuffer:NO
sharegroup:nil
multiSampling:NO
numberOfSamples:0];
self.director = (CCDirectorIOS*) [CCDirector sharedDirector];
self.director.wantsFullScreenLayout = YES;
// Display FSP and SPF
[self.director setDisplayStats:NO];
// set FPS at 60
[self.director setAnimationInterval:1.0/60];
// attach the openglView to the director
[self.director setView:glView];
// for rotation and other messages
[self.director setDelegate:self];
// 2D projection
[self.director setProjection:kCCDirectorProjection2D];
// [director setProjection:kCCDirectorProjection3D];
// Enables High Res mode (Retina Display) on iPhone 4 and maintains low res on all other devices
if( ! [self.director enableRetinaDisplay:NO] )
CCLOG(#"Retina Display Not supported");
// Default texture format for PNG/BMP/TIFF/JPEG/GIF images
// It can be RGBA8888, RGBA4444, RGB5_A1, RGB565
// You can change anytime.
[CCTexture2D setDefaultAlphaPixelFormat:kCCTexture2DPixelFormat_RGBA8888];
// When in iPhone RetinaDisplay, iPad, iPad RetinaDisplay mode, CCFileUtils will append the "-hd", "-ipad", "-ipadhd" to all loaded files
// If the -hd, -ipad, -ipadhd files are not found, it will load the non-suffixed version
//[CCFileUtils setiPhoneRetinaDisplaySuffix:#"-hd"]; // Default on iPhone RetinaDisplay is "-hd"
[CCFileUtils setiPadSuffix:#""]; // Default on iPad is "" (empty string)
//[CCFileUtils setiPadRetinaDisplaySuffix:#"-ipadhd"]; // Default on iPad RetinaDisplay is "-ipadhd"
// Assume that PVR images have premultiplied alpha
[CCTexture2D PVRImagesHavePremultipliedAlpha:YES];
}
- (void) endCocos {
CC_DIRECTOR_END();
self.director = nil;
}
Actually, what I do is a call to initCocos just before pushing my director, and endCocos just after closing the game, like
AppDelegate *appDelegate = (AppDelegate *) [[UIApplication sharedApplication] delegate];
[[CCDirector sharedDirector] dismissModalViewControllerAnimated:YES];
[appDelegate endCocos];
Hope it helps.