title: Button on the bottom programmatically
body: <p>I am trying to use this library:</p>
  
  <p><a href="https://github.com/yannickl/DynamicButton#requirements" rel="nofollow noreferrer">https://github.com/yannickl/DynamicButton#requirements</a></p>
  
  <p>And I need to put the bottom programmatically (Swift) on the bottom of my ViewController with a bit of distance between the bottom and the button. How could I do it ?</p>