When you want to get a `String` from an `Int` and format this `String`, you need to use `NSNumberFormatter`.

The following code creates a `NSNumberFormatter` that has at least two integer digits:

 let formatter = NSNumberFormatter()
 formatter.minimumIntegerDigits = 2
 
 for myInt in 1...3 {
 let str = formatter.stringFromNumber(myInt)
 println(str)
 }