cocos2d for iPhone

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

1. 

   arsenio
   Member

   Hi guys!

   I hope this post isn't that confusing, but I have a problem that is making my brain hurt. I am not good at programming haha! So my problem is this and I am very sorry if it just sounds like confusion:

   I started a project using the Cocos template.

   My project has a Session class and a Game class. The Session class contains a couple of variables that must exist throughout the life of my program.

   Game = a single hand of blackjack
   Session = 5 hands of a blackjack (i.e. 5 Games)

   So, what I want to do ideally is that when the game starts, a new Session instance is created, which tracks how much money the player has left (let's call this session.moneyLeft)

   Then I start an instance of Game which is a Cocos scene, and when that Game is done, the session.moneyLeft variable is updated, and then a new Game begins which checks out the session.moneyLeft variable to set it's game conditions.

   So my problem is that I just can't figure out how to get this going, my program is like this right now:

   BlackJackAppDelegate : applicationDidFinishLaunching
   --> this method sets up a sharedDirector and calls runWithScene:Game

   Game : +(id) scene
   -(void) init These methods set up a blackjack table and play out a hand of blackjack

   This is all fine, but I can't figure out how to get the Game instances to read the Session.moneyLeft variables - I would just move all the stuff in BlackJackAppDelegate : applicationDidFinishLaunching to the Session class, but when I do that it doesn't work.

   I guess what I am asking is, how could I move the SharedDirector and runScene somewhere other than the AppDelegate, can I? Or is that totally idiotic?

   (By the way, that is why this is a Cocos2d question, not just an objective C question)

   Argh, is this super obvious and I'm just tired and whatever? Thoughts?

   Posted 1 year ago #
2. 

   David994A
   Member

   I'm not 100% sure what you are asking - I think you are talking about a problem of scope. You want to create a kind of global object that is visible and accessable by your other objects/classes. What you might want to look into is what is known as a Singleton Class. The Director in cocos2d is a singleton class which is why you can access it in all of your files as long as you put the #import "cocos2d.h" at the top of your classes .h files.

   Here are some resources for you:

   http://numbergrinder.com/node/29
   http://getsetgames.com/2009/08/30/the-objective-c-singleton/
   http://www.iphonedevsdk.com/forum/iphone-sdk-development/5302-how-make-global-variables-objectivec.html

   Just do a google search and you can find more info.

   I hope this helps

   Posted 1 year ago #
3. 

   Codemattic
   Moderator

   Session could be a property of your BlackJackAppDelegate and you could access it there from anywhere. It could be a global. It could be a singleton.

   Posted 1 year ago #
4. 

   Codemattic
   Moderator

   Here is a discussion on using different kinds of globals:

   http://www.cocos2d-iphone.org/forum/topic/551

   Posted 1 year ago #
5. 

   arsenio
   Member

   Yesss, that was what I needed: To make the Session a singleton. I actually tried that last night, but whatever I was doing must have been wrong, cause it didn't work then, but today I googled a bit more and found some more effective code for making it a Singleton and it works great. thanks David and Codemattic, this board is the best!!

   Posted 1 year ago #
6. 

   Lam
   Member

   If you mastered implementing singletons and can do it off by heart then read onwards.

   If you haven't then stop right here! ... There's nothing for you to see.

   ...

   Matt Gallagher wrote up a post, Singletons, AppDelegates and top-level data, awhile back about how to synthesize your own singletons so if you're lazy like I am then it's even easier to create singletons from scratch.

   http://cocoawithlove.com/2008/11/singletons-appdelegates-and-top-level.html

   Now googling a bit, you'll find CJ Hanson's own modifications of synthesizing singletons (which I personally prefer) that uses method swizzling to deal with synchronized locks.

   So now you can do

   Header
   

   #import "SynthesizeSingleton.h"
   
   @interface ImAClass : NSObject {
   }
   SYNTHESIZE_SINGLETON_FOR_CLASS_HEADER(ImAClass)
   ..methods below
   @end

   Implementation
   

   @implementation ImAClass
   
   SYNTHESIZE_SINGLETON_FOR_CLASS(ImAClass)
   
   @end

   And then you can access the singleton through:
   

   [ImAClass sharedInstance];

   Posted 1 year ago #
7. 

   dbolli
   Member

   I prefer to keep all my globals in a StatsLayer and refer via e.g.

   StatsLayer *sl = (StatsLayer *)[self.parent getChildByTag:kStatsLayerTag];		// :dbolli:091226 11:35:31 Get StatsLayer address

   I have created a demo to illustrate this using Lam's wonderful ProgressTimer Class

   See http://public.me.com/dbolli/iphone%20projects/dosh-demo-cocos2d-iphone.zip

   You will need to have cocos2d-iphone-0.99.0 at the same dir level as dosh-demo-cocos2d-iphone
   and COCOS2D_SRC defined in Xcode Preferences->Source Trees with Path ../cocos2d-iphone-0.99.0 and Display Name cocos2d-iphone src

   Enjoy :)

   Posted 1 year ago #

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