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

Use NSCharacter on the entire string,not character-by-character:

let whitespace = NSCharacterSet.whitespaceCharacterSet()

let phrase = "Test case"
let range = phrase.rangeOfCharacterFromSet(whitespace)

// range will be nil if no whitespace is found
if let test = range {
    println("whitespace found")
}
else {
    println("whitespace not found")
}

Output:

whitespace found