title: How to move UIButton programmatically?
body: <p>I would like to move one UIButton from:
  <a href="https://i.stack.imgur.com/VKJQm.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/VKJQm.png" alt="from here"></a></p>
  
  <p>to the bottom of the screen programmatically, how can I do that?</p>