Demo Example Swift Code

I am learning to program an app using Swift and would like help with some specific requirements. And would like some example code written. iPhone 6 Demo App Using SpriteKit What I would like to do is to attach two SKSpriteNodes together. Node 1 square 150x150 Node 2 square 50x50 I would like the two nodes to be independent within the GameScene, I would like to be able to drag and drop each node within the scene, but if I drag node 2 over Node 1 (top left corner) and release my finger, Node 2 anchors to Node 1 in the top left corner. Now when I move Node 2, Node 1 moves with it. There needs to be physics applied to the scene and when the touch event ends the Nodes fall to the bottom of the scene. If I press node 2 again, the anchoring is removed and the 2 Nodes are independent again, both affected by physics. I would like the same to happen for each corner of Node 1. I would like to be able add additional Nodes to the scene with the same functionality. There fore each Node will have its own class. I hope that makes sense. I would require the code to be heavily commented so I can learn how it works.