title: Perform action by clicking on some word in Uitextview or UILabel
body: <p>How can I do to perform some specific action (like showing a modal or pushing a controller) when user click on some formated/specific word in Uitextview (or UIlabel) ?
  I've heard about NSAttributedString but I'm not sure how to make this with it.</p>
  
  <p>What I want to have is the same results as the facebook app. When you click on a name it push another controller :</p>
  
  <p><img src="https://i.stack.imgur.com/YLQs8.png" alt="facebook example"></p>
  
  <p>If you can give me some hint, tutorial or whatever you want please.</p>