title: marquee effect on UILabel by removing and adding letters - Swift 3
body: <p>Can anyone explain me how can i achieve this effect in Swift 3.0? It's almost a marquee effect but i would like not to slide the UILabel. </p>
  
  <p>It would be great to do it like this </p>
  
  <p><a href="https://i.stack.imgur.com/ZAj9v.gif" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ZAj9v.gif" alt="enter image description here"></a></p>
  
  <p>the first letter is removed and the 20th letter is added, later the second letter is removed and 21 is added and so on till the end of the text in a string. I'm a noobling and i really do not know how to even start with it.</p>