在Swift中解析JSON并访问值？

Question

I have successfully parsed JSON for:

birthday = "04/10/1986";
    id = 202038339983;
    location =     {
        city = Jupiter;
        country = "United States";
        state = FL;
    };

My question is when part of the JSON is:

    submissions =     {
     data =         (
                        {
                "created_time" = "2018-02-16T05:11:56+0000";
                id = "131448394823824_167398094382256";
                viewer = "Any random string and/or emojis";
            },

                    {
            "created_time" = "2018-02-14T23:36:41+0000";
            id = "809809871824_8908987486899";
            message = "vday \Ud83d\Udda4\U2665\Ufe0f";
        });}

How am I supposed to access created_time, id, viewer, and message?

I have been able to print the whole submissions JSON response to the console with this code :

           guard let jsonD = responseFromServer as? [String : Any] else {return}
            let subs1 = (jsonD["submissions"] as? [String : Any])
            let accessSubs1 = theSubs1
            guard let parsedPost = theSubs1  else {
                return
            }

My console will display:

    ["data": <__NSArrayI 0x6040001a86c0>(
{
                   "created_time" = "2018-02-16T05:11:56+0000";
                    id = "131448394823824_167398094382256";
                    viewer = "Any random string and/or emojis";
                },

                        {
                "created_time" = "2018-02-14T23:36:41+0000";
                id = "809809871824_8908987486899";
                message = "vday \Ud83d\Udda4\U2665\Ufe0f";
            })]

My question is how should I parse the JSON so I can access the created_time inside submissions?

Here is the HTTP Request:

    struct XClass: RequestProtocol {

    var Path = "/User"
    var parameters: [String : Any]? = ["stuff": "id, birthday, location, submissions"]
    var aToken = aToken.current
    var httpMethod: RequestHTTPMethod = .GET
    var apiVersion: APIVersion = .defaultVersion

    struct Response: ResponseProtocol {

        var id = String()
        var birthday = String()
        var city = String()
        var state = String()
        var country = String()
        var viewSubs = [String : Any]()



        init(XResponse: Any?) {


            guard let jsonD = XResponse as? [String : Any] else {return}
            id = (jsonD["id"] as? String)!
            birthday = (jsonD["birthday"] as? String)!
            let XArr = (jsonD["location"] as? [String : String])
            city = XArr!["city"]!
            country = XArr!["country"]!
            state = XArr!["state"]!
            let subs1 = (jsonD["submissions"] as? [String : Any])
            let accessSubs1 = theSubs1
            guard let parsedPost = theSubs1  else {
                return
            }
            viewSubs = theSubs1
            }}}

                func getXData(){
           let connection = RequestConnection()
           connection.add(XClass()) { response, result in
           switch result {
               case .success(let response):
                  print("Request Succeeded: \(response)\n\n\n")
               case .failed(let error):
                  print("Request Failed: \(error)")
          }}
              connection.start()
           }

Answer 1

Create a struct

struct Data: Decodable {
    var created_time : String
    var id : String
    var viewer : String
}

call to the api url from URLSession

guard let url = URL(string: "your api url")
URLSession.shared.dataTask(with: url) { (data, response, error) in
if error != nil {
   print(error.localizedDescription)
} else {
   guard let data = data else {return}
   var data: [Data]() = JSONDecoder().decode(Data.self, data)
   for dat in data{
       print(dat.created_time)
       print(dat.id)
       print(dat.viewer)
   }
}

Answer 2

If you are not using Decodable from Swift 4, or still in Swift 3, then you can specify that the data in "submissions" is an array of dictionaries (double brackets) then you can iterate that.

Change

        let subs1 = (jsonD["submissions"] as? [String : Any])

To

        let subs1 = (jsonD["submissions"] as? [[String : Any]])

        for sub in subs1 {
            let time = sub["created_time "] as? [String : Any]
            ...
        }