Forward declaration in SpriteKit - ios

Question

I have an issue with forward declaration in SKScene I have to show a label node's value from game scene to game over scene , for example , but the value it returns as null , here is my code :
GameOver Scene :
#import "MyScene.h"
#class MyScene;
#interface GameOver : SKScene {
MyScene *mainScene;
}
#implementation GameOver
- (void)didMoveToView:(SKView *)view {
scores = [[SKLabelNode alloc]initWithFontNamed:#"Pixel LCD7"];
scores.fontSize = 30;
scores.fontColor = [SKColor darkGrayColor];
//displaying score :
scores.text = [NSString
stringWithFormat:#"Score:%#",mainScene.scoreLabel.text];
scores.name = #"score";
scores.position = CGPointMake(CGRectGetMidX(self.frame), 230);
[self addChild:scores];
}
MyScene
#import "MyScene.h"
#class GameOver;
#interface MyScene : SKScene {
SKLabelNode *scoreLabel;
}
#property (nonatomic) SKLabelNode *scoreLabel;

Answer 1

It doesn't work because you initialise the label in wrong method.
Remove didMoveToView: method if you use it just to initialise and set up the label and move the code to initWithSize: method:
-(id)initWithSize:(CGSize)size {
if (self = [super initWithSize:size]) {
// Your init code here
scores = [[SKLabelNode alloc]initWithFontNamed:#"Pixel LCD7"];
scores.fontSize = 30;
scores.fontColor = [SKColor darkGrayColor];
//displaying score :
scores.text = [NSString stringWithFormat:#"Score:%#",mainScene.scoreLabel.text];
scores.name = #"score";
scores.position = CGPointMake(CGRectGetMidX(self.frame), 230);
self addChild:scores];
}
return self;
}
You should add property to your GameOver Scene to accept your score or override initWithSize: to for example initWithSize:score: and you should update your score label when you initialise game over scene.