How to parse array in Swift 3 - arrays

Question

I have some JSON but it's in a matrix and I do not know how to get the values separately. For example, get the last name.
This is the JSON structure:
{
"login": true,
"token": "m5CnQ",
"usuario": [
{
"names": "Sergio Alejandro",
"las_name": "Rosado",
}
]
}
This is my code:
do {
print("recibimos respuesta")
let responseString = String(data: data, encoding: .utf8)
print("respuesta : \(responseString)")
if let json = try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.allowFragments) as? [String: String] {
DispatchQueue.main.async {//proceso principal
var nombre = json["nombre"]//constante
print("respuestanom : \(nombre)")
}
}
} catch let parseError {//manejamos el error
print("error al parsear: \(parseError)")
let responseString = String(data: data, encoding: .utf8)
print("respuesta : \(responseString)")
}
}
task.resume()

Answer 1

have you tried usuario[0].las_name

Answer 2

If you are on Swift 4, use the new Decodable protocol:
First define your data model:
struct MyDataModel: Decodable {
struct User: Decodable {
var names: String
var lastName: String
private enum CodingKeys: String, CodingKey {
case names, lastName = "las_name"
}
}
var login: Bool
var token: String
var user: [User]
private enum CodingKeys: String, CodingKey {
case login, token, user = "usuario"
}
}
Then the decoding is really simple:
do {
let model = try JSONDecoder().decode(MyDataModel.self, from: data)
print(model)
} catch let parseError {
print(parseError)
}

Answer 3

i resolved my problem this way:
JSON:
{
"login": "TRUE",
"token": "eyJ0eXAiOiJKV12la70",
"usuario": [
{
"id": "36",
"id_empresa": "1",
"nombres": "Sergio Alejandro",
"apellido_paterno": "Rosado",
"apellido_materno": "Dzul",
"zona_horaria": "America/Merida",
"id_perfil": "1",
"correo": "russelalexis123#gma.com",
"username": "empleadodemo",
"passwd": "*A4B6157319038724E3560894F7F932C8886EBFCF",
"activo": "1",
"fh_captura": "2017-02-20 21:02:55",
"domicilio": "",
"cp": "",
"telefono": "",
"usuario": "1",
"no_licencia": null,
"fecha_expedicion": null,
"fecha_vigencia": null
}
]
}
code
struct MyDataModel: Decodable {
struct User: Decodable {
var id: String?
var id_empresa: String?
var nombres: String?
var apellido_paterno: String?
var apellido_materno: String?
var zona_horaria: String?
var id_perfil: String?
var correo: String?
var username: String?
var activo: String?
var fh_captura: String?
var domicilio: String?
var cp: String?
var telefono: String?
var usuario: String?
private enum CodingKeys: String, CodingKey {
case id="id", id_empresa="id_empresa", nombres="nombres", apellido_paterno="apellido_paterno", apellido_materno="apellido_materno", zona_horaria="zona_horaria", id_perfil="id_perfil", correo="correo", username="username", activo="activo", fh_captura = "fh_captura", domicilio="domicilio", cp="cp", telefono="telefono", usuario="usuario"
}
}
var login: String
var token: String
var user: [User]
private enum CodingKeys: String, CodingKey {
case login, token, user = "usuario"
}
}
print("envar solicitud")
let url = URL(string: "http://webservice")!
var request = URLRequest(url: url)
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type");
request.httpMethod = "POST"
let postString = "usuario=jose&password=1234"
request.httpBody = postString.data(using: .utf8)
let task = URLSession.shared.dataTask(with: request) { data, response, error in
guard let data = data else {//si existe un error se termina la funcion
print("solicitud fallida \(error)")//manejamos el error
return //rompemos el bloque de codigo
}
do {
let model = try JSONDecoder().decode(MyDataModel.self, from: data)
print(model.user[0].correo)
} catch let parseError {
print(parseError)
}
}
task.resume()