Classes or Structs for Models in Swift - swift

Question


I want to implement IgListKit for my UICollectionView. This Library requires me to use “Class Model : ListDiffable”
Accoding to my current architecture I have “Struct Model : Decodable” As I use JSON Decoder in my NetworkService to retrieve Data
I have 2 struct, 1 for the Root and the 2 for my Array.
struct Talents : Decodable {
let status : String?
let error : String?
let response : String?
}
struct Talent: Decodable {
let id: String
let name : String
let smallDesc: String
let largeDesc : String
}
\\I also have enum CodingKeys to match the keys for both structs
Following is the Struct output ,Works well to be used in my UICollectionView
when I change these structs to class
class Talents : Decodable {
var status : String?
var error : String?
var response : String?
init( status : String,error : String, response : String){
self.status = status
self.error = error
self.response = response
}
}
This is the Class Output I get, Which I am not sure how to use.
What are the changes I should make in order to resolve this, and apply : ListDiffable Protocol stubs to my Model class?
Service File with the instance of which in viewDidLoad of my CollectionVC I take the Data in an array.
static func getCategoryTalents(category:String,completion: #escaping (Bool, [Talent]?, Error?) -> Void) {
let parameters: Parameters = [
"filter": category,
"shuffle": 1
]
AF.request(Constants.baseUrl,
parameters : parameters ).response { response in
guard let data = response.data else {
DispatchQueue.main.async {
print("\(Error.self)")
completion(false, nil, Error.self as? Error)
}
return}
do {
let talentsResponse = try JSONDecoder().decode(Talents.self, from: data)
print(talentsResponse)
let firstJSONString = talentsResponse.response?.replacingOccurrences(of: "\\", with: "")
let secondJSONString = firstJSONString?.replacingOccurrences(of: "\"{", with: "{").replacingOccurrences(of: "}\"", with: "}")
guard let talentArray = try! JSONDecoder().decode([Talent]?.self, from: (secondJSONString?.data(using: .utf8)!)!) else {
return }
print(talentArray)
var talents = [Talent]()
for talent in talentArray {
guard let individualTalent = talent as Talent? else { continue }
talents.append(individualTalent)
}
DispatchQueue.main.async {
completion(true, talents, nil)
}
} catch {
DispatchQueue.main.async {
completion(false, nil, error)
}
}
}
}

Answer 1

You don't need to change the existing struct to class create a new class and make an initializer which accepts struct as the parameter:
struct TalentDataModel: Decodable {
let status : String?
let error : String?
let response : String?
}
class Talents: Decodable {
var status : String?
var error : String?
var response : String?
init(dataModel: TalentDataModel) {
status = dataModel.status
error = dataModel.error
response = dataModel.response
}
}

Answer 2

Since it is a whole lot of work to make serve Models with srtucts as seen here
I changed my class to make it work with IGListKit.
import Foundation
import IGListKit
class Talents: NSObject,Decodable {
let status : String
let error : String
let response : String
init(status:String,error:String,response:String) {
self.status = status
self.error = error
self.response = response
}
}
extension NSObject: ListDiffable {
public func diffIdentifier() -> NSObjectProtocol {
return self
}
public func isEqual(toDiffableObject object: ListDiffable?) -> Bool {
return isEqual(object)
}
}