cocos2d for iPhone

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

1. 

   Picoly
   Member

   Hello,

   I'm new with Obj-C and of course cocos2D.

   Currently I want execute the methode of the parent scene of a layer:

   I have definied a dummy method like this:

   @implementation GameScene
   - (int)getInt {
   return 100;
   }
   @end

   In the child layer I try to execute the method:

   int i = [(GameScene*)self.parent getInt];
   NSLog(@"Int from parent scene: %d", i);

   But unfortunately the return from getInt is always "0".

   What is getting wrong there?
   It can't be so difficult just to execute a method of the parent object..

   Thanks for any suggestions.

   Regards
   Jürgen

   Posted 2 years ago #
2. 

   BMR
   Member

   Hi,
   What i did is : take one property
   id delegate; in layer and assign Scene to this variable.
   Now from your layer you can do like:
   int i = [delegate getInt];

   -BMR

   Posted 2 years ago #
3. 

   crmagicxxx
   Member

   @Picoly

   I suppose you're trying that in the "init" method of the child layer? Try the same code in some other methods, e.g. "onEnter" method and it should work.

   Posted 2 years ago #
4. 

   Picoly
   Member

   @BMR
   I also have try your variant, but it doesn't work :-(

   @crmagicxxx
   I have now changed the code to ensure that the parent scene / delegation object must exist before calling "fillScreen", where I call "getInt":

   This happens in the init of my parent scene:

   BoardLayer *boardLayer = [BoardLayer node];
   boardLayer.delegate = self;
   [self addChild:[BoardLayer node]];
   // In this method I call "getInt" from the parent scene
   boardLayer.fillScreen;

   My Layer-Objekt look like this:

   @interface BoardLayer : Layer {
   GameScene *delegate;
   int getInt;
   }
   @property(nonatomic, retain) GameScene *delegate;
   - (void) fillScreen;
   @end

   Any other suggestions?
   Jürgen

   Posted 2 years ago #
5. 

   crmagicxxx
   Member

   You obviously didn't listen what I told you. You don't need any delegates/pointers to the Scene that already exists as parent. Just call [parent getInt] outside the init method of the child layer

   Posted 2 years ago #
6. 

   shazbox
   Member

   I'm not sure about the original problem, but this line I think you have wrong: [self addChild:[BoardLayer node]];
   I assume you are trying to add the layer you just created (otherwise why would you create it?) So you should have:
   [self addChild:boardLayer];

   The code you have now creates a new BoardLayer object and adds it to the scene, as opposed to using the one you have already initialized.

   This code:
   'int i = [(GameScene*)self.parent getInt];
   NSLog(@"Int from parent scene: %d", i);'

   should then output 100, if you added BoardLayer to the GameScene object correctly.

   Posted 2 years ago #
7. 

   Picoly
   Member

   @crmagicxxx:
   I have tried both ways: with delegates and with self.parent,
   but the error was in giving the layer to the scene (in my second code)

   @shazbox:
   thanks! this was the error I've made,
   now the output result is 100

   Jürgen

   Posted 2 years ago #

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