cocos2d for iPhone

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

1. 

   tape2
   Member

   Basic question alert! I have a 'GameLayer' layer with the method 'startGame'. This layer also contains another layer called 'MenuLayer'. So in order to call the startGame method from within MenuLayer I use:

   [parent startGame];

   Which gives me: 'warning: Cocosnode may not respond to '-startGame' (Messages without a matching signature will be assumed to return 'id' and accept '...' as arguments.)

   I declared the startGame method in GameLayer.h, so why do I get this warning?

   Posted 2 years ago #
2. 

   ob1
   Member

   Did you include GameLayer.h ?
   Are you sure "parent" is a GameLayer and not a Layer ?
   Are you sure the definition is the .h is correct ?

   Posted 2 years ago #
3. 

   tape2
   Member

   1) Yes.

   2) Eh? Isn't it both at the same time? Because GameLayer is a Layer.

   3) here is GameLayer.h:

   #import "cocos2d.h"

   @interface GameLayer : Layer
   {
   }

   -(void) startGame;

   @end

   4) Also, I don't know if this is relevant but I used this code to create the MenuLayer:

   [self addChild:[MenuLayer node] z:100 tag:kTagMenu];

   Posted 2 years ago #
4. 

   tape2
   Member

   I forgot to mention, the code DOES work, but I want to get rid of the warning.

   Posted 2 years ago #
5. 

   ob1
   Member

   I would like to see where you declare "parent".

   Posted 2 years ago #
6. 

   tape2
   Member

   I didn't declare 'parent' anywhere. I assumed 'parent' always refers to the, well, parent. And since the code does work, it apparently does?

   How should I declare it?

   Posted 2 years ago #
7. 

   ob1
   Member

   How is it a cocos node property?

   Then you need this :

   GameLayer* gameParent = (GameLayer*) parent;
   [gameParent startGame];

   Posted 2 years ago #
8. 

   tape2
   Member

   Awesome, thanks a lot!

   I'm new to Objective-C (and even C) so these basic things are sometimes still a mystery to me :-)

   Thanks again!

   Posted 2 years ago #
9. 

   ob1
   Member

   Well, the warning was because as you said a GameLayer is a Layer, but the opposite is not true, a Layer is always a GameLayer.

   Parent is a Layer. A Layer doesn't have a startGame method. But since you know for a fact that your parent is GameLayer, you can cast parent to a GameLayer to tell the compiler it does in fact implement startGame.

   You're welcome.

   Posted 2 years ago #

RSS feed for this topic

Reply

You must log in to post.