cocos2d for iPhone

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

1. 

   Cyber
   Member

   Hello,

   I'm rewriting code of an game i've made. That coda was pretty crappy, so i am now trying it again.
   I want to use multiple layers in one scene now. This is the code i use:

   GameScene.h
   

   #import "cocos2d.h"
   #import "GameTileLayer.h"
   #import "GameTankLayer.h"
   #import "GameControlLayer.h"
   #import "GameUILayer.h"
   
   @interface GameScene : Scene {
   
   }
   
   +(id) scene;
   
   @end

   GameScene.m
   

   #import "GameScene.h"
   
   @implementation GameScene
   
   +(id) scene;
   {
   	Scene *scene = [Scene node];	
   
   	return scene;
   }
   
   - (id) init {
       self = [super init];
       if (self != nil) {
   
   		Layer *layer1 = [GameTileLayer node];
   		Layer *layer2 = [GameTankLayer node];
   		Layer *layer3 = [GameControlLayer node];
   		Layer *layer4 = [GameUILayer node];
   		[self addChild:layer1 z:0];
   		[self addChild:layer2 z:1];
   		[self addChild:layer3 z:2];
   		[self addChild:layer4 z:3];
   
       }
       return self;
   }
   
   @end

   TileLayer.m

   #import "GameTileLayer.h"
   
   @implementation GameTileLayer
   
   - (id) init {
       self = [super init];
       if (self != nil) {
   		Sprite *bg = [Sprite spriteWithFile:@"GameBgr.png"];
   		[bg setPosition:ccp(160, 240)];
   		[self addChild:bg z:10];
   
       }
       return self;
   }
   
   @end

   So, I added a background Sprite to the GameTileLayer, but it won't show up in the game. What am I doing wrong?

   Posted 2 years ago #
2. 

   redsky
   Member

   Hey Cyber,

   I feel a little weak on this subject but I am doing something similar and it's working.

   If your GameScene.m adds two lines, your example works for me. I left everything else as you had it. Not sure if this is best/correct way...

   +(id) scene
   {
   	// 'scene' is an autorelease object.
   	Scene *scene = [Scene node];
   
           // add these two lines before your return
   
   	// 'layer' is an autorelease object.
   	GameScene *layer1 = [GameScene node];
   
   	// add layer as a child to scene
   	[scene addChild: layer1 z:0 tag: 1000 ];
   
   	// return the scene
   	return scene;
   }

   Posted 2 years ago #
3. 

   Codemattic
   Moderator

   Maybe:
   

   +(id) scene;
   {
   	GameScene *scene = [GameScene node];	
   
   	return scene;
   }

   Posted 2 years ago #
4. 

   Cyber
   Member

   @redsky
   If you do it that way, you add 4 scenes, not layers. :P

   @Codemattic
   It works perfectly! Now I can build myself a nice layered game! Thank you!

   Posted 2 years ago #
5. 

   Lam
   Member

   I'm glad Codemattic helped you solve the problem.

   I'm unsure of what's happening here as it's starting to lose some helpful cocos method calls.

   If your scene returns a scene through that 'scene' static method. Wouldn't it be more conventional to just use the static node method?

   I'm assuming you are doing this somewhere.

   GameAppDelegate where you actually instantiate your scene:
   

   [[Director sharedDirector]replaceScene:[GameScene scene]];

   But that's the same as calling the node method. And this is provided already in the CocosNode class.
   

   [[Director sharedDirector]replaceScene:[GameScene node]];

   Both ways work of course so it's not a big deal but I guess if you use the node you didn't have to write up that scene method.

   Posted 2 years ago #
6. 

   redsky
   Member

   @cyber
   lol! i've got some code to go fix!

   @codemattic
   thanks for helping. it seems so obvious now.

   Posted 2 years ago #
7. 

   Codemattic
   Moderator

   youre welcome guys.

   Posted 2 years ago #

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