Ensure # of chars dose not exceed the limit (UITextField)

textField.swift

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        let nsString = textField.text as NSString?
        let newString = nsString?.replacingCharacters(in: range, with: string)
        if let string = newString,
            string.count > YOUR_LIMIT_HERE {
            return false
        }
        return true
    }