Validate nonempty string

String+Extensions.swift

extension String {
  //Validate both that a string is nonempty and that it contains something besides whitespace.
  //  Useful for driving things like enabling a submit button only when a user has entered (meaningful) text
    var isVisuallyEmpty: Bool {
        return self.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
    }
}