title: access child nodes in spritekit
body: <p>Hi all i'm new in spriteKit and objective-c and I would like to create a spriteNode in a method and remove it in another method (same .m file)
  In this method i create the sprite:</p>
  
  <pre><code>(void)createSceneContents{ /*in this method i create and add the spaceship spriteNode
          SKSpriteNode *spaceship = [SKSpriteNode spriteNodeWithImageNamed:@"Spaceship"];
  
          //code...
  
          //Add Node
          [self addChild:spaceship];
      }
  </code></pre>
  
  <p>And now i would like to remove the node touching it, but I only know the method for handle touch events is:</p>
  
  <pre><code>-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
  </code></pre>
  
  <p>I'm trying to access my spaceship node from there i can't. I've tried everything without success. IS there a way to send a node from a method to another?? Or without sending it, is it 
  posible to access to a children node from a method where it's not declared??</p>