如何快速解析Json对象3

Question

您好，我的问题与json对象有关。我有这个链接“http://ip-api.com/json”，这个链接给出了你的IP地址的详细信息。我只需要在swift 3中打印来自这个json文件的IP地址。我很新可能是我的问题很基本，但我需要一些帮助来整理我的项目。所以我做了如下。

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() 

非常感谢提前。

Answer 1

的IP地址是在JSON的顶级关键query值

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

在斯威夫特3 JSON字典的类型是[String:Any]

PS：你并不需要一个这个任务的URL请求，直接传递的网址，并使用原生结构URL（和URLRequest）

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