Question

I have a level scene in my game in which I am selecting the level. In this scene I am displaying the level selected in a CCLabelTTF. Now I want to pass the value displayed on this label to my main scene. I am doing this as follows:

HelloWorld *hello=[HelloWorld getInstance];  //HelloWorld is main scene  

hello.strLevel=[lblLevel string];  //strLevel is NSString to which I am passing the label text  

[[CCDirector sharedDirector]replaceScene:[HelloWorld node]];  

In my HelloWorld scene I am using singleton to share the value of label used in Level scene.

//HelloWorld.h  


@interface HelloWorld : CCColorLayer  

{  

NSString *strLevel;  

}  

@property(nonAtomic,retain)NSString *strLevel;  

+(HelloWorld*)getInstance;  

HelloWorld.mm  

@implementation HelloWorld  

@synthesize strLevel;  

static HelloWorld *instance=nil;  

__________________________  

//Some code  

__________________________  


+(HelloWorld*)getInstance  

{  

if(instance==nil)  

{  

instance=[HelloWorld new];  

} 

return instance;  

}  

However this isn’t working.As soon as control reaches

instance=[HelloWorld new];  

init() is called. And why not. However when the control reaches back to Level scene at the line where I am passing the value, nothing happens and HelloWorld shows the value null for strLevel.

I know singleton is a better way to pass values than AppDelegate. But I am unable to do so.Can someone correct me?

Thanks

Answer 1

Use singleton. What should my Objective-C singleton look like? this is a good discussion on the singleton in obj-c. good luck

[EDIT]

 HelloWorld *hello=[HelloWorld getInstance]; //HelloWorld is main scene  
 hello.strLevel=[lblLevel string]; //strLevel is NSString to which I am passing the label text
 [[CCDirector sharedDirector]replaceScene:[HelloWorld node]];

The HelloWorld instance that you’re passing to the replaceScene is not the same as
the HelloWorld *hello you passed the singleton instance to. That’s why there is no strLevel value in it. The strLevel value is placed in your HelloWorld singleton though. Try

NSLog(@"%@",[[HelloWorld getInstance] strLevel]); //somewhere in the code