title: SKSpriteNodes not appearing
body: <p>So i currently think i have set up these sprite nodes fine and they should be appearing but i cannot figure it out why they are not showing up in the simulator. Both the background image(bg.png) and the "bird" node appear but none of the nodes inside spawnPipes method are appearing. I am newish to using SpriteKit so it could be something obvious. </p>
  
  <p>Sprite node method:</p>
  
  <pre><code>-(void)spawnPipes;
  {
  
      int random = (arc4random() % (int)self.frame.size.height-150)+250;
  
      //Add pipe end
      SKSpriteNode *upperPipe = [SKSpriteNode spriteNodeWithImageNamed:@"goldend.png"];
      upperPipe.size = CGSizeMake(70, 25);
      upperPipe.position = CGPointMake(450, random);
  
      //Add pipe middles
      SKSpriteNode *lowerPipe = [SKSpriteNode spriteNodeWithImageNamed:@"goldend.png"];
      lowerPipe.size = CGSizeMake(70, 25);
      lowerPipe.position = CGPointMake(upperPipe.position.x, upperPipe.position.y-150);
  
      //Rest below
      SKSpriteNode *restBelow = [SKSpriteNode spriteNodeWithImageNamed:@"goldmiddle.png"];
      restBelow.size = CGSizeMake(60, lowerPipe.position.y);
      restBelow.position = CGPointMake(lowerPipe.position.x, lowerPipe.position.y-restBelow.size.height/2-lowerPipe.size.height/2+1);
  
      //Rest above
      SKSpriteNode *restAbove = [SKSpriteNode spriteNodeWithImageNamed:@"goldmiddle.png"];
      restAbove.size = CGSizeMake(60, self.frame.size.height+upperPipe.position.y);
      restAbove.position = CGPointMake(upperPipe.position.x, upperPipe.position.y+restAbove.size.height/2+upperPipe.size.height/2-2);
  
      [self addChild:upperPipe];
      [self addChild:lowerPipe];
      [self addChild:restBelow];
      [self addChild:restAbove];
  
      [pipeArray addObject:upperPipe];
      [pipeArray addObject:lowerPipe];
      [pipeArray addObject:restBelow];
      [pipeArray addObject:restAbove];
  
  
  }
  </code></pre>
  
  <p>Which is then called in initWithSize:</p>
  
  <pre><code>-(id)initWithSize:(CGSize)size {    
      if (self = [super initWithSize:size]) {
  
          //Bird
          bird = [SKSpriteNode spriteNodeWithImageNamed:@"Godcrop.png"];
          bird.position = CGPointMake(self.frame.size.width/2, self.frame.size.height/2);
          bird.size = CGSizeMake(30, 30);
          bird.zPosition = 3;
  
          bird.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:bird.frame.size];
          bird.physicsBody.usesPreciseCollisionDetection = YES;
          bird.physicsBody.mass = 0.2;
          bird.physicsBody.affectedByGravity = NO;
          bird.physicsBody.dynamic = YES;
          [self addChild:bird];
  
          //Background
          bg = [SKSpriteNode spriteNodeWithImageNamed:@"bg.png"];
          bg.position = CGPointMake(160, 284);
          bg.size = CGSizeMake(self.frame.size.width, self.frame.size.height);
          [self addChild:bg];
  
          //Spawns pipes
          [self spawnPipes];
  
          //Set touch boolean for touches began methods
          firstTouch = YES;
  
  
  
      }
      return self;
  }
  </code></pre>