how to parse this json in swift? - ios

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 !!)

Answer 1

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

Answer 2

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.

Answer 3

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 :)