When you want to get a `String` from `Int`, `NSNumber`, etc. and also want to format this `String`, you can 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)
 print(str)
 }

With this `formatter`, you may expect a result like this:

 let str0 = formatter.stringFromNumber(0) //"00"
 let str1 = formatter.stringFromNumber(1) //"01"
 let str2 = formatter.stringFromNumber(10) //"10"
 let str3 = formatter.stringFromNumber(100) //"100"