无法在Swift 3中转换JSON数据

Question

我将项目从Obj-c转换为Swift 3，我无法从Web方法中读取JSON响应。据我所知，代码看起来像是它的Obj-c对应物的良好转换，但是JSONSerilaization遇到了麻烦。

我会发布旧的Obj-c，但它分布在几个NSURLConnection委托方法中。如果需要我可以发布这个吗？

斯威夫特3：

// Set up the URL request
    var getString : String = "https://TheWebMethod"

    guard let url = URL(string: getString) else {
        print("Error: cannot create URL")
        return
    }
    let urlRequest = URLRequest(url: url)

    // set up the session
    let config = URLSessionConfiguration.default
    let session = URLSession(configuration: config)

    // make the request
    let task = session.dataTask(with: urlRequest) {
        (data, response, error) in
        // check for any errors
        guard error == nil else {
            print("error calling GET on Method")
            print(error)
            return
        }
        // make sure we got data
        guard let responseData = data else {
            print("Error: did not receive data")
            return
        }
        // parse the result as JSON, since that's what the API provides
        do {

            guard let result = try JSONSerialization.jsonObject(with: responseData, options: []) as? [String: AnyObject] else {
                print("error trying to convert data to JSON")
                return
            }

            print("The result is: " + result.description)

            guard let resultTitle = result["title"] as? String else {
                print("Could not get title from JSON")
                return
            }
            print("The title is: " + resultTitle)
        } catch  {
            print("error trying to convert data to JSON")
            return
        }
    }

    task.resume()

通过浏览器运行时的JSON输出示例：

[{"id":"3","Initials":"TL","FullName":"Tony Law","LoginName":"test","Password":"password","EmailAddress":"myemailaddress","MobileTelNo":"0123456789","SecToken":"Secret"}]