How can I check to see if a string contains characters of whitespace/alphanumeric/etc?

Question

How can you use the \"ctype.h\" library in Swift to be able to use isAlpha or isSpace on characters? Or is there a better, Swift, way of doing it?

Answer 1

This answer works with text fields. I was going crazy trying to search for whitespace on a UItextfield without searching the string content of it. This works for UItextfields:

Swift 4:

    if (textField.text?.contains(" "))!{
        print("Has space")
    }else{
        print("Does not have space")
    }

This is for a regular string, also in swift 4

    if string.contains(" "){
        print("Has space")
    }else{
        print("Does not have space")
    }