title: Doing a chrono for an iOS app
body: <p>Im just new in this of programming APPs and I have just started into the world of iOS.</p>
  
  <p>I am trying to learn by myself, just following a course I have found on the net (CS193P - Stanford). </p>
  
  <p>The question is simple, I think.</p>
  
  <p>I would like to implement a chronometer (for a friend who is always late, want to chrono the time I spent waiting him haha), but I don't know how to operate. A "refreshing label"?</p>
  
  <p>Any tips? Thanks in advance.</p>
  
  <p>By the way, I would really appreciate any course you should think is interesting for me.</p>