title: Read More/Less with Swift 3
body: <p>I want to add "<strong>Read more</strong>" at the end of the paragraph. When I click on the "Read more" text, it should be expand and display "<strong>Less</strong>" at the end. 
  The texts will be collapsed when click on "Less" text. <br></p>
  
  <p><a href="https://i.stack.imgur.com/OWUpT.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/OWUpT.jpg" alt="enter image description here"></a>
  <br>
  I find many sample work in google. But, I don't understand clearly and most projects are implemented with Objective-C. I also find it in youtube.
  <br> I would like know very sample code to implement this with <strong>Swift 3</strong>.
  <br>Can I implement without using any additional library?
  <br> Please help me.</p>