Help understanding how to communicate objects

(3 posts) (3 voices)

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QcMat
Member

Hi.

I'm an old procedural programmer who has problems with some Objective-C / Cocos2d concepts.

Here is an example of what I don't understand:

-You have a gameScene object which is a subclass of Scene.
-In that gameScene, I have 2 layers: gameLayer and controlLayer.
-controlLayer has 1 menu Object with 2 Arrow menu items.
-in the Control layer, I have 2 BOOL variables (synthesized) that get updated in a tick method when the buttons are pressed or not.

How can I communicate with the Gamelayer from the Controllayer?

I have a tick method in gameScene where I try to move a sprite when the BOOL is set to 1.

I've read pretty much every example and tutorial available but fail to understand how to communicate with parent's childs and different layers.

Posted 2 years ago #
simo
Member
How about adding pointer variable to the controlLayer?
```
... {
gameLayer *game;
}
@property (retain) gameLayer *game;
```
And then synthesize setGame and getGame methods.

You should be able to set a pointer to your gameLayer, and call it's methods using
```
[game doSomething];
```
Posted 2 years ago #
UseCase
Member

I believe you can ask the scene graph for the other layer.

Layer *OtherLayer = (Layer*)[self.parent getChildByTag:LayerTag];

or

Scene *MyScene = self.parent;
Layer *OtherLayer = (Layer*)[MyScene getChildByTag:LayerTag];

Posted 2 years ago #

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