title: I want to fix a button position in the scroll view in swift 3.0
body: <p><a href="https://i.stack.imgur.com/hQnEZ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hQnEZ.png" alt=""></a></p>
  
  <p>I want to fix a button position in the scroll view, but scroll view has scrollable content also this button has outer from scroll view frame. I researched a lot but can't find the solution.
  Scroll view has Blue color and the main view has the green color, the main view is the parent of the scroll view. And button has a yellow color, I want this button in scroll view but not scrollable, and its position will be same as the image.</p>