What is the best way to determine if a string contains a character from a set in Swift

Question

I need to determine if a string contains any of the characters from a custom set that I have defined.

I see from this post that you can use rangeOfString to determine

Answer 1

Use like this in swift 4.2

    var string = "Hello, World!"
    let charSet = NSCharacterSet.letters
    if string.rangeOfCharacter(from:charSet)?.isEmpty == false{  
      print ("String contain letters");
    }