我想做一个函数，特殊字符应该被过滤掉。就像如果用户在文本区域中输入任何东西，如果他/她输入特殊字符，那么它将抛出并弹出警报。现在它几乎适用于所有字符，除了单引号和双引号，我想包括[“和' ]。谁能帮我一下。非常感谢！！！

func textViewDidChange(_ textView: UITextView) {
        guard var textViewText = textView.text else {
            return
        }
        var specialCharacterSet = CharacterSet(charactersIn: "₹!@#$%^&*()_+{}[]|<>?;=-")
        specialCharacterSet.insert(charactersIn: "'")
        

        if let range = textViewText.rangeOfCharacter(from: specialCharacterSet) {
            textViewText = textViewText.replacingCharacters(in: range, with: "")
            textView.text = textViewText

            let alertController = UIAlertController(title: "Error", message: "Special characters are not allowed!", preferredStyle: .alert)
            alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
            present(alertController, animated: true, completion: nil)
        }
    }

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