Cocos2d v2.0 - Set Up Scenes, Layers, Sprites, etc

Question

With Cocos2d v2.0.0, a lot of changes were made and a lot of people are experiencing some scaling problems and other conflicts ...

This is even more true if they read and test out Ray Wenderlich's great book : Learning Cocos2d : The viking guy is to big, the background is not centered, the suffix system for images is not working, ...

So, how to proceed ?

Answer 1

Basically, everything is already told in the sample project when creating a new cocos2d v2 project. But, some of us need to get things pointed out.

• Image Suffix System for iPhone (Non-retina & Retina) and iPad (Non-retina & Retina)

Check out lines 68-71 from AppDelegate.m Here is what you need to remember :

1. You just need to call

   CCSprite *mySprite = [CCSprite spriteWithFile:@"mySprite.png"];
   

2. No need for some if(iPad) then else if(iPhone) blabla
3. Make sure you called your images like as lines 68-71 from AppDelegate.m (Default : mySprite.png (iPhone) | mySprite-hd.png (iPhone Retina) | mySprite-ipad.png (iPad) | mySprite-ipadhd.png (iPad Retina)

• Calling a Scene

Check out line 76 from AppDelegate.m

1. Just call the scene function from your class (using pushScene)

   [director_ pushScene: [MyScene scene]];
   

• Adding layers to your scene class

1. Supposing your scene class is called with the +(CCSene*)scene function (which is a good practice for cocos2d v2)

2. +(CCScene *) scene
   {
       // 'scene' is an autorelease object.
       CCScene *scene = [CCScene node];
   
       BackgroundLayer *backgroundLayer = [BackgroundLayer node];
       [scene addChild:backgroundLayer z:0];
   
       GameplayLayer *gameplayLayer = [GameplayLayer node];
       [scene addChild:gameplayLayer z:5];
   
       return scene;
   }
   

• Replacing the init function from your classes (CCScene, CCLayer, ...)

This is where scaling problems from v2 of cocos2d come from (but I do not know why).

1. Instead of calling -(id)init, call

   -(void) onEnter{ //Do some sprite displaying with [self addChild:mySprite]; }
   

2. You can still call the -(id)init function for other things you need to load before displaying sprites.

• Using SneakyInput (Joystick opensource library)

You can find how to use sneakyinput with cocos2d v2 here : http://cl.ly/1J2D2z0f3o0r3h041o3o

• Multi Touch Enabling

1. Add this line to your layer (in the +(CCScene*) scene function or else where)

   layer.isTouchEnabled = YES;
   

2. Then add this to the same .m

   - (void)ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 
   {
       NSArray *touchArray=[touches allObjects];
   
       if ([touchArray count] == 2)
       {
           NSLog(@"2");
       }
       else if([touchArray count]==1)
       {
           NSLog(@"1");
       }
   }
   

3. Finally, go to the AppDelegate.m and add this :

   [[CCDirector sharedDirector].view setMultipleTouchEnabled:YES];
   

I would much appreciate if cocos2d v2 developers could help out and post stuff about how to use cocos2d v2 compared to v1.