ios – SKLabelNode未显示在屏幕上

@property BOOL contentCreated

然后在实施中

//just like in Apple's example project

- (void)didMoveToView: (SKView *) view {
   if (!self.contentCreated) {
       [self createSceneContents];
       self.contentCreated = YES;
   }
}

- (void)createSceneContents {
    self.BACkgroundColor = [SKColor whiteColor];
    self.scaleMode = SKScenescaleModeAspectFill;
    SKLabelNode *newGameNode = [[SKLabelNode alloc] initWithFontNamed:
        @"Helvetica"];
    newGameNode.name = @"NewGame";
    newGameNode.text = @"New Game";
    newGameNode.fontSize = 30;
    newGameNode.fontColor = [SKColor whiteColor];
    newGameNode.position = CGPointMake(100,100);
    [self addChild:newGameNode];
}

但是当我跑步时,屏幕上什么都没有显示出来.我究竟做错了什么？