Check if an NSString is just made out of spaces

Question

I want to check if a particular string is just made up of spaces. It could be any number of spaces, including zero. What is the best way to determine that?

Answer 1

Have to use this code for Swift 3:

func isEmptyOrContainsOnlySpaces() -> Bool {

    return self.trimmingCharacters(in: .whitespaces).characters.count == 0
}