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

For Swift 5

extension String {

    func containsWhiteSpace() -> Bool {

        // check if there's a range for a whitespace
        let range = self.rangeOfCharacter(from: .whitespacesAndNewlines)

        // returns false when there's no range for whitespace
        if let _ = range {
            return true
        } else {
            return false
        }
    }
}