title: Changing height of UIView in response to finger drag
body: <p>I understand that the title is a bit confusing so I'll try my best to explain it well. I have a UIView that has a fixed width of 100, and a variable height that starts at 0. What I want to be able to do is drag my finger from the base of the UIView, towards the top of the screen, and the UIView changes its height/extends to the position of my finger. If that's still to complicated just imagine it as a strip of paper being pulled out from under something.</p>
  
  <p>If you can help, that would be really great. I don't think it should be too hard, but I'm only a beginner and I can understand if I haven't explained it well!</p>