title: Sprites spawning in incorrect position
body: <p>I have a row of 5 sprites and they spawn every 4 seconds and move down along the Y-axis. The sprites are spawning the correct amount each time, I have 5 sprites equal spaced apart across the screen, they're all center perfectly. </p>
  
  <p>However when the performSelector action is called, when it spawns them in they don't go to the right position. The move over to the left so far that I can only see half a sprite on the left side of the screen. After testing it, it seems they are all stacked on top of each other at the wrong position.</p>
  
  <p>Any idea whats going on? I'd appreciate any help. Here's all the code I'm using in the scene.</p>
  
  <pre><code>-(void) addBricks:(CGSize)size {
  for (int i = 0; i &lt; 5; i++) {
      //create brick sprite from image
      SKSpriteNode *brick = [SKSpriteNode spriteNodeWithImageNamed:@"brick"];
      //resize bricks
      brick.size = CGSizeMake(60, 30);
      //psoition bricks
      int xPos = size.width/7.5 * (i+.5);
      int yPos = 450;
      brick.position = CGPointMake(xPos, yPos);
  
      //add move action
      SKAction *wait = [SKAction waitForDuration:3];
      SKAction *move = [SKAction moveByX:0 y:-36.9 duration:1];
      SKAction *sequence = [SKAction sequence:@[wait, move]];
      SKAction *repeatMove = [SKAction repeatActionForever:sequence];
  
  
      [brick runAction:repeatMove];
      [self addChild:brick];
  
  }
  }
  
  -(id)initWithSize:(CGSize)size {
  if (self = [super initWithSize:size]) {
      self.backgroundColor = [SKColor colorWithRed:(243.0f/255) green:(228.0f/255) blue:(165.0f/255) alpha:1.0];
  
      //add action to spawn bricks
      SKAction *spawn = [SKAction performSelector:@selector(addBricks:) onTarget:(self)];
      SKAction *delay = [SKAction waitForDuration:4];
      SKAction *delayThenSpawn = [SKAction sequence:@[delay, spawn]];
  
      [self runAction:[SKAction repeatActionForever:delayThenSpawn]];
  
      [self addBricks:size];
  
  
  }
  return self;
  }
  </code></pre>