CCNode Hud, not acting as Hud but "scrolling with scene" - ios

Question

Attempting to simply have a scene where I have the gameplay, and the hud. Since I have it positioning the scene (which contains both layers), I assume this is why my Menu button is moving even though it's in the Hud Layer.
To fix it I would think that I would maybe have to change this line
[self setCenterOfScreen: mainChar.position];
to something like this:
[gameLayer setCenterOfScreen: mainChar.position];
But then I get this:
No visible #interface for CCNode declares the selector
'setCenterOfScreen:'
Here is the
GameScene (commented where I think issue is):
+ (GameScene *)scene
{
return [[self alloc] init];
}
// -----------------------------------------------------------------------
- (id)init
{
self = [super init];
if (!self) return(nil);
CGSize winSize = [CCDirector sharedDirector].viewSize;
self.userInteractionEnabled = YES;
self.theMap = [CCTiledMap tiledMapWithFile:#"AftermathRpg.tmx"];
self.contentSize = theMap.contentSize;
CCNode *gameLayer = [CCNode node];
gameLayer.userInteractionEnabled = YES;
gameLayer.contentSize = self.contentSize;
[self addChild:gameLayer];
[gameLayer addChild:theMap z:-1];
self.mainChar = [CCSprite spriteWithImageNamed:#"mainChar.png"];
mainChar.position = ccp(200,300);
[gameLayer addChild:mainChar];
// POSSIBLY WHY BOTH LAYERS ARE SHIFTING, RATHER THEN HUD STANDING STILL,
// I essentially want the gameLayer to be centered on screen, not both.
// I tried [gameLayer setCenterOfScreen: mainChar.position] but got error posted above
[self setCenterOfScreen: mainChar.position];
CCNode *hudLayer = [CCNode node];
hudLayer.userInteractionEnabled = YES;
hudLayer.position = ccp(winSize.width * 0.9, winSize.height * 0.9);
[self addChild:hudLayer];
CCButton *backButton = [CCButton buttonWithTitle:#"[ Menu ]" fontName:#"Verdana-Bold" fontSize:18.0f];
backButton.positionType = CCPositionTypeNormalized;
backButton.position = ccp(0.85f, 0.95f); // Top Right of screen
[backButton setTarget:self selector:#selector(onBackClicked:)];
[hudLayer addChild:backButton];
return self;
}
but then I just get:
Just confused on how I would set up a scene, to initially have 2 layers - one that keeps position in say the top right as a HUD, and the other that scrolls with scene for gameplay when telling it to.

Answer 1

This is related to the other question you asked here (Adding a Hud Layer to Scene Cocos2d-3) which I posted the answer to. In the future it is better to modify your original OP in your first question rather than create a new question that is almost the same.
Hope this helped.