how to parse this json in swift?

Question

I have a request

Alamofire.request(.GET,HttpHelper.baseURL+HttpHelper.tripsURL,encoding:.JSON).responseJSON {
response in 

    var json  = JSON(data: response.data!)
    print(json)
    print(json["res"])
}

followed by the result

{
  "res" : "[{\"name\":\"testName\",\"lastName\":\"testLastName\"},{\"name\":\"testName\",\"lastName\":\"testLastName\"}]",
  "status" : "success",
  "out" : "{\"name\":\"testName\",\"lastName\":\"testLastName\"}"
}
[{"name":"testName","lastName":"testLastName"},{"name":"testName","lastName":"testLastName"}]

how i can set data from res to struct or class User

struct  User  {
    var name : String?
    var lastName : String?
}

please help to solve this problem) thank you very much !!)

Your response is an array ob objects so you need to parse as array of User, this can be done using alamofire protocols `ResponseObjectSerializable` and `ResponseCollectionSerializable` — Reinier Melian, Aug 01 '16 at 14:44
Hi, and welcome to SO! What have you tried so far and where did you fail? If you are already using `Alamofire`, maybe try `AlamofireObjectMapper`? — Losiowaty, Aug 01 '16 at 14:44

score 2 · Answer 1 · answered Aug 01 '16 at 14:41

2

You can do something like that

var result: [User]()
for user in json["res"] {
   let userTmp = User(name: user["name"], lastName: user["lastName"])
   result.append(userTmp)
}

Regards

answered Aug 01 '16 at 14:41

Arnaud Wurmel

480
3
15

so I tried but did not work ((Xcode breaks all the code is black and not backlit and does not compile( – МИКОЛА ШАХ Aug 01 '16 at 15:03

score 0 · Answer 2 · answered Aug 01 '16 at 15:32

Basically, it would be:

class User {
  var name : String?
  var lastName : String?
}

var theUsers = [User]()

Alamofire.request(.GET,HttpHelper.baseURL+HttpHelper.tripsURL,encoding:.JSON)
  .responseJSON { response in 
    var json  = JSON(data: response.data!)
    print(json)

    theUsers = json["res"].map {
      return User (name: $0["name"], lastName: $0.["lastName"])
    }
  })

However, along the way, you might need some typecasting. For example, maybe replace json["res"] with (json["res"] as Array<Dictionary<String,String>>) in order to keep the type checker and type inferencer happy.

This solution is also completely breaks the whole project with error: **Command failed due to signal: Segmentation fault: 11** — МИКОЛА ШАХ, Aug 02 '16 at 08:36

score 0 · Answer 3 · answered Aug 07 '18 at 14:57

I'm using native Codable protocol to do that:

class MyClass: Codable {

    var int: Int?
    var string: String?
    var bool: Bool?
    var double: Double?
}


let myClass = MyClass()
myClass.int = 1
myClass.string = "Rodrigo"
myClass.bool = true
myClass.double = 2.2

if let json = JsonUtil<MyClass>.toJson(myClass) {
    print(json) // {"bool":true,"string":"Rodrigo","double":2.2,"int":1}

    if let myClass = JsonUtil<MyClass>.from(json: json) {
        print(myClass.int ?? 0) // 1
        print(myClass.string ?? "nil") // Rodrigo
        print(myClass.bool ?? false) // true
        print(myClass.double ?? 0) // 2.2
    }
}

And I created a JsonUtil to help me:

public struct JsonUtil<T: Codable>  {

    public static func from(json: String) -> T? {
        if let jsonData = json.data(using: .utf8) {
            let jsonDecoder = JSONDecoder()

            do {
                return try jsonDecoder.decode(T.self, from: jsonData)

            } catch {
                print(error)
            }
        }

        return nil
    }

    public static func toJson(_ obj: T) -> String? {
        let jsonEncoder = JSONEncoder()

        do {
            let jsonData = try jsonEncoder.encode(obj)
            return String(data: jsonData, encoding: String.Encoding.utf8)

        } catch {
            print(error)
            return nil
        }
    }
}

And if you have some issue with Any type in yours objects. Please look my other answer:

https://stackoverflow.com/a/51728972/3368791

Good luck :)

how to parse this json in swift?

3 Answers3

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