title: Position a UIView relative to the bottom of the parent view?
body: <p>How can I align a UIView to the bottom of the parent so that the Y coordinate of the frame is relative to the bottom of the screen instead of the top?</p>
  
  <p>This would be the equivalent to setting the .bottom property in HTML.</p>
  
  <p>This is because I want to make sure my view is always at the bottom of window regardless of the height of the parent.</p>