cocos2d for iPhone

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

1. 

   SonnyBurnette
   Member

   Sorry for the vague title but I didn't really know how to describe my issue.

   I have 2 layers in my GameScene -- gameLayer and HudLayer.

   I have a method in my HudLayer that sets the score to show and the user's health level. I am having trouble calling that method from the init of my gameLayer

   [hudLayer updateHealth:50]

   I have tried rearranging the order of what gets initialized first in the GameScene. Is what I need to do possible? Or do I have to save this data out to a text file and have the hud read the text file on init?

   Posted 2 years ago #
2. 

   Codemattic
   Moderator

   Sonny, in your gameScene create your hudLayer first. Then pass that to the init of your gameLayer so it has a link to the hudLayer. Im typing this in Firefox so I may get some of it wrong - but the general idea is:
   

   #import "Layer.h"
   #import "HudLayer.h"
   
   @interface GameLayer : Layer
   {
     HudLayer *hudLayer;
   }
   @property (readwrite,retain) HudLayer *hudLayer;
   -(id) initWithHudLayer: (HudLayer *)aHudLayer;
   @end
   
   @implementation GameLayer
   @synthesize hudLayer;
   -(id) initWithHudLayer: (HudLayer *)aHudLayer
   {
     if( ! [super init] )
       return nil;
     self.hudLayer=aHudLayer;
     // do stuff with hudLayer
     return self;
   }
   - (void) dealloc
   {
     self.hudLayer=nil;
     [super dealloc];
   }

   hth, Codemattic

   Posted 2 years ago #
3. 

   Codemattic
   Moderator

   I saved hudLayer as a property of GameLayer bc I figured that throughout the game your gameLayer will need to update the hud. If thats wrong and you just need it for the init you can ignore all the property stuff.

   Posted 2 years ago #
4. 

   SonnyBurnette
   Member

   Awesome. I will rearrange my code to try.

   I already have the ability to reference my Hud from within my gamelayer but I went another route. I have been including other classes' .h files in the implementation and adding @class to the .h. I am not sure that is correct or not but it was the only way I found that worked. Sending a message during init is when I hit a snag. I will go ahead and post the skeleton (I cut it down a little but left the relevant parts) for you to comment:

   GameScene.h
   _____________
   
   #import "cocos2d.h"
   #import "GameLayer.h"
   #import "HUDLayer.h"
   
   @interface GameScene : Scene {
   	GameLayer *gameLayer;
   	HUDLayer *hudLayer;
   }
   
   @property (nonatomic, retain) GameLayer *gameLayer;
   @property (nonatomic, retain) HUDLayer *hudLayer;
   @end
   
   GameScene.m
   ______________
   
   #import "GameScene.h"
   
   @implementation GameScene
   @synthesize gameLayer, hudLayer;
   
   - (void) dealloc {
   	[gameLayer release];
   	[hudLayer release];
   	[super dealloc];
   }
   
   - (id) init {
       self = [super init];
       if (self) {
   
   		self.hudLayer = [[HUDLayer alloc] init];
   		self.gameLayer = [[GameLayer alloc] init];
   
   		[self.hudLayer setGameLayer:gameLayer];
   		//NOT sure why setHudLayer works but setHUDLayer does not.
   		[self.gameLayer setHudLayer:hudLayer];
   
   		//Add the layers to our scene
   		[self addChild:gameLayer z:0];
   		[self addChild:hudLayer z:1];
   
       }
       return self;
   }
   
   @end
   
   GameLayer.h
   ______________
   
   #import "cocos2d.h"
   
   @class HUDLayer;
   
   @interface GameLayer : Layer {
   	HUDLayer *hudLayer;
   }
   
   @property (readwrite,assign) HUDLayer *hudLayer;
   
   @end
   
   GameLayer.m
   _______________
   
   #import "GameLayer.h"
   #import "MenuScene.h"
   #import "HUDLayer.h"
   
   @implementation GameLayer
   
   @synthesize hudLayer;
   
   - (id) init {
       self = [super init];
   
   	if (self != nil) {
   		[hudLayer updateHealth: 50];
       }
       return self;
   }
   
   @end

   Posted 2 years ago #
5. 

   Codemattic
   Moderator

   The only reason I made it a parameter to the init method is bc you said "I am having trouble calling that method from the init of my gameLayer", otherwise your code is good.

   "//NOT sure why setHudLayer works but setHUDLayer does not."

   bc you defined the property in GameLayer as "hudLayer" (its the classname which is named "HUDLayer") so the correct setter is "setHudLayer" - but you should be able to just use dot notation if thats clearer:

   gameLayer.hudLayer=hudLayer;

   Posted 2 years ago #
6. 

   SonnyBurnette
   Member

   Actually, I left my code mostly in place and used your init. It works great. Thanks for the follow up.

   Posted 2 years ago #

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