iOS swift UITextField 限制输入指定的字符 限制输入字符的长度

    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        if type == .cameraName {
            
        }else{
            return true;
        }
        guard let text = textField.text else{
            return true
        }
        //防止删除键无效
        if string == ""{
            return true;
        }
        //设置只能输入str后面字符串中的字符
        let str = "1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ@_:-. ";
        var cs:NSCharacterSet = NSCharacterSet.init(charactersIn: str);
        let str1 = string.components(separatedBy: cs as CharacterSet);
        let str2 = str1.joined(separator: "");
        let result = str2 == string;
        print(result);

        if result == true{
            postValueBlock!();
        }
        //设置输入的长度不超过10
        let textLength = text.characters.count + string.characters.count - range.length
        
        return textLength<=10 && !result;
    }
    

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