cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   darkbyte1981
   Member

   I have a Sprite class: GameTable, which has a class method "scene()". And an instance method "init()".

   +(id)scene creates a [Scene node], a [GameTable node] (which executes the init()), then returns the Scene *.
   The init() creates some sprites and add them to self by [self addChild:theSprite z:...];

   Now, if during startup (in the appdelegate method) I create the scene by:

   Scene *theScene = [[GameTable scene] retain];

   When I call the [[Director sharedDirector] runWithScene:theScene], I see a black background with some white boxes that should be the sprites created in the init().
   If I call the [[Director sharedDirector] runWithScene:[GameTable scene]], I see a full-white screen.

   The only way to make things working is to remove the [[GameTable scene] retain] at startup (however called AFTER initializing the director's stuff), and use the [[Director sharedDirector] runWithScene:[GameTable scene]] syntax.
   Ok, let's suppose I did something wrong in the startup: creating my scene when cocos2d is not ready. Why a second call to [Gametable scene] doesn't work properly?
   How can I switch between scenes if I cannot create two scenes at startup?

   Posted 1 year ago #
2. 

   darkbyte1981
   Member

   I meant "I have a Scene class".

   Posted 1 year ago #
3. 

   azka
   Member

   Look into cocos2d examples to understand it, there is answer for you, its not easy to explain it here :)

   Posted 1 year ago #
4. 

   darkbyte1981
   Member

   What examples? Where can I find them? What one can help me?

   Posted 1 year ago #
5. 

   azka
   Member

   look at cocos2d wiki, look at forums at some examples... this is cool one.

   http://www.raywenderlich.com/352/how-to-make-a-simple-iphone-game-with-cocos2d-tutorial

   Posted 1 year ago #
6. 

   darkbyte1981
   Member

   Ehm... I'm looking at cocos2d wiki, but I am not able to find nothing about my guess...
   Little help, please? :|

   Posted 1 year ago #
7. 

   azka
   Member

   There are example projects, download some look into the source and try to understand it :] if i understood it then u will also :D

   Posted 1 year ago #
8. 

   cjl
   Member

   @darkbte

   You haven't included enough code, but what is 'self' that you are adding the sprite to?

   If 'init' is an instance method of your sprite class, maybe you should be adding the sprite as a child of the scene, which I'm guessing your code does not do.

   Posted 1 year ago #
9. 

   darkbyte1981
   Member

   Ok.
   This is my test class:

   @interface MyTestScene : Layer
   {
   }
   +(id)scene;

   @end

   @implementation MyTestScene

   +(id)scene
   {
   Scene *theScene = [Scene node];

   MyTestScene *layer = [MyTestScene node];
   layer->isTouchEnabled = YES;

   [theScene addChild:layer];

   return theScene;
   }

   -(id)init
   {
   if (self = [super init])
   {
   Sprite *theBackground = [Sprite spriteWithFile:@"table.png"];
   [theBackground setPosition:CGPointMake(160, 240)];
   [self addChild:theBackground z:0];
   }

   return self;
   }

   @end

   In my app's delegate, at startup, applicationDidFinishLanching, I configure the Cocos2D in this way:

   if (![Director setDirectorType:CCDirectorTypeDisplayLink])
   [Director setDirectorType:CCDirectorTypeDefault];

   [[Director sharedDirector] setPixelFormat:kPixelFormatRGBA8888];
   [Texture2D setDefaultAlphaPixelFormat:kTexture2DPixelFormat_RGBA8888];
   [[Director sharedDirector] setAnimationInterval:1.0/60];

   // Override point for customization after app launch
   [window addSubview:viewController.view];
   [window makeKeyAndVisible];
   [window setUserInteractionEnabled:YES];
   [window setMultipleTouchEnabled:YES];

   Ok, the app starts and I see the view created in Interface Builder.

   In an IBAction function (a click on a bar-button), I use the following code to show the scene:

   [currentView removeFromSuperview];
   currentView = NULL;
   [[Director sharedDirector] attachInWindow:self.window];
   [[Director sharedDirector] runWithScene:[MyTestScene scene]];
   [[Director sharedDirector] setDeviceOrientation:CCDeviceOrientationLandscapeLeft];

   and all works fine.

   I tried to change the startup adding the following line:

   theScene = [[MyTestScene scene] retain];

   (I've declared MyTestScene *theScene in a module).

   So, I changed the click function:

   [[Director sharedDirector] runWithScene:theScene];

   and won't go. I just see black screen with white sprites.

   So coming back to ... runWithScene:[MyTestScene scene], I just see a white screen.
   I must remove the theScene = [[MyTestScene scene] retain] at startup and all goes fine.
   It seems that creating first [MyTestScene scene] invalidates the second call to [MyTestScene scene].

   Why?

   What if I want to swap scenes? What if I need to create two scenes at starting and use them at need?

   Posted 1 year ago #
10. 

    cjl
    Member

    OK - your initial post was misleading, or perhaps I misunderstood it.

    I'm not sure what your exact problem is, but in general when you see a white screen or white boxes for sprites it means your adding your sprites ( or layers or scenes) to an uninitialized or incompletely initialized parent.

    The fact that your not using 'pure' cocos2d, but instead starting with an IB view, is probably where you are going wrong. There is a demo in the tests that ship with Cocos2d, I think it's called 'Attach Demo' or something. You should read through that code to see how it's done.

    Also, I'm not sure why you would think a second call to a method that doesn't work would produce different results.

    Anyway, sorry I couldn't be of more help, but I think you should really read through the code included with the Cocos2d tests.

    Posted 1 year ago #
11. 

    azka
    Member

    Use backtips " ` " to show the code :]

    Posted 1 year ago #

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