title: NSNumber with commas
body: <p>Maybe this is a silly answer but I'm pretty new on ios.. I have to show a number in an specific way in my app. Currently, I have numbers that I receive from a service in an NSString. But, e.g. if I have a number: 123456789, i need to show it in a label as 123.456.789 .. anyone knows if there is some way to do that?</p>
  
  <p>Edit: add ios and iphone tags</p>