Json4swift model class - swift

Question

I am new to swift , using json4swift tool to make model class. I would like to know how to get data from model class , i managed to map the items to model class using below code.
let responseModel = Json4Swift_Base(dictionary: searchResultsData)
My json responce folllows:
{
"success": true,
"categorys": [
{
"categoryId": 1,
"categoryName": "Electricians "
},
{
"categoryId": 2,
"categoryName": " Drivers "
},
{
"categoryId": 3,
"categoryName": " Plumbers "
},
{
"categoryId": 4,
"categoryName": "Carpenters "
},
{
"categoryId": 5,
"categoryName": "Automobile works "
}
]
}
Json4swift tool made two classes namely Json4Swift_Base and Categorys class. I need to get from model class.

Answer 1

If you want to learn Swift, I would suggest you to forget json4swift.
First, you have to build your owns models: Category and Response
Category:
struct Category {
let id: Int
let name: String
}
Response:
struct Response {
let success: Bool
let categories: [Category]
}
Second, you want to initialize your models with a JSON. We are going to create a protocol for that:
typealias JSONDictionary = [String : Any]
protocol JSONDecodable {
init?(dictionary: JSONDictionary)
}
Your models must implement this protocol, so we add extensions:
Category extension:
extension Category: JSONDecodable {
init?(dictionary: JSONDictionary) {
guard let id = dictionary["categoryId"] as? Int,
let name = dictionary["categoryName"] as? String else {
return nil
}
self.id = id
self.name = name
}
}
Response extension:
extension Response: JSONDecodable {
init?(dictionary: JSONDictionary) {
guard let success = dictionary["success"] as? Bool,
let jsonCategoriesArray = dictionary["categorys"] as? [JSONDictionary] else {
return nil
}
self.success = success
self.categories =
jsonCategoriesArray.flatMap{ jsonCategoryDictionary in
Category(dictionary: jsonCategoryDictionary)
}
}
}
Now, you can write:
let response = Response(dictionary: jsonResponse)
if let response = response {
let success = response.success
let categories = response.categories
let firstCategory = categories[0]
// ...
}