如何在Swift 3中解析Json对象

Question

嗨，我的问题与json对象有关。 我有此链接“ http://ip-api.com/json ”，此链接提供了您的IP地址的详细信息。 我只需要在Swift 3中从此json文件中打印IP地址。我很新，可能是我的问题很基本，但是我需要一些帮助来整理项目。 所以因为我已经做了如下。

let requestURL: NSURL = NSURL(string: "http://ip-api.com/json")!

    let urlRequest: NSMutableURLRequest = NSMutableURLRequest(url: requestURL as URL)
    let session = URLSession.shared
    let task = session.dataTask(with: urlRequest as URLRequest) {
        (data, response, error) -> Void in

        let httpResponse = response as! HTTPURLResponse
        let statusCode = httpResponse.statusCode

        if (statusCode == 200) {
            print("Everyone is fine, file downloaded successfully.")

            do{

                let json = try JSONSerialization.jsonObject(with: data!, options:.allowFragments) as! [String:AnyObject]

                if let stations = json["city"] as? [[String: AnyObject]] {



                  for station in stations {

                      if let name = station["regionName"] as? String {

                        self.names.append(name)
                        print("this is query\(name)")

                      }
                      else{
                         print ("no ip address is found")
                    }

                  }

                }

            }
            catch {
                print("Error with Json: \(error)")
            }

        }
    }

    task.resume()

提前谢谢了。

Answer 1

IP地址是JSON顶层密钥query的值

let json = try JSONSerialization.jsonObject(with: data!, options:.allowFragments) as! [String:Any]
if let query = json["query"] as? String {
  print(query)
}

在Swift 3中，JSON字典的类型为[String:Any]

PS：您不需要此任务的URL请求，直接传递URL并使用本机结构URL （和URLRequest ）

let requestURL = URL(string: "http://ip-api.com/json")!
...
let task = session.dataTask(with: requestURL) {