get the current scene returns NULL? - objective-c

Question

I am trying to reload the current scene , and the init is happen then dealloc .
i want to have a condition on the dealloc to return back if it called from the current scene.
i was trying this :
if ([[[CCDirector sharedDirector] runningScene] getChildByTag:16])
return;
and
[[[CCDirector sharedDirector] runningScene] isKindOfClass:[HelloWorldLayer class]]
both gives me NULL, and condition is not true.
why is that ???
my scene looks like :
+(CCScene *) scene
{
// 'scene' is an autorelease object.
CCScene *gameScene = [CCScene node];
// 'layer' is an autorelease object.
HelloWorldLayer *layer = [HelloWorldLayer node];
layer.tag=16;
// add layer as a child to scene
[gameScene addChild: layer];
// return the scene
return gameScene;
}
how can i eliminate the dealloc when i only refresh the scene ??

Answer 1

Never do this:
[[CCDirector sharedDirector] replaceScene:self]
or this:
CCDirector* director = [CCDirector sharedDirector];
[director replaceScene:director.runningScene];
You can not replace the current scene simply by passing self or the currently running scene to the replaceScene method. You always have to create a new instance of your CCScene class:
[[CCDirector sharedDirector] replaceScene:[MyScene scene]]
Be careful with the runningScene. The first time you send the runWithScene message to the director, the runningScene will always be nil. You can defer some initialization to the onEnter method:
-(void) onEnter
{
// runningscene is valid in onEnter
[[CCDirector sharedDirector] runningScene];
[super onEnter];
}