Can't save custom class array to UserDefaults - ios

Question

I'm trying to save a custom class array to UserDefaults but it doesn't work. I get nil back on if let. I looked everywhere online. I'm using Swift 4.2
extension UserDefaults {
func saveReciters(_ reciters: [Reciter]) {
do {
let encodedData = try NSKeyedArchiver.archivedData(withRootObject: reciters, requiringSecureCoding: false)
self.set(encodedData, forKey: UD_RECITERS)
} catch {
debugPrint(error)
return
}
}
func getReciters() -> [Reciter] {
if let reciters = self.object(forKey: UD_RECITERS) as? Data {
return NSKeyedUnarchiver.unarchiveObject(with: reciters) as! [Reciter]
} else {
print("EMPTY RECITERS")
return [Reciter]()
}
}
}
UserInfo={NSDebugDescription=Caught exception during archival: -[_SwiftValue encodeWithCoder:]: unrecognized selector sent to instance 0x600001babcc0
Thats my class:
class Reciter: NSCoding {
private(set) public var name: String
private(set) public var image: UIImage?
private(set) public var surahs: [Surah]
private(set) public var documentID: String
private let quranData = QuranData()
init(name: String, image: UIImage?, surahCount: Int?, documentID: String) {
self.name = name
self.image = image
self.documentID = documentID
if let surahCount = surahCount {
surahs = Array(quranData.getAllSurahs().prefix(surahCount))
} else {
surahs = quranData.getAllSurahs()
}
}
func encode(with aCoder: NSCoder) {
}
required init?(coder aDecoder: NSCoder) {
}
}
On my Surah class i get nil back. All other properties i get back succesfully

Answer 1

Most often I see developer's use codeable, here I am using user as an example:
YourDataModel.swift
struct User: Codable {
var userId: String = ""
var name: String = ""
var profileImageData: Data? }
UserDefaults.swift
import Foundation
extension UserDefaults {
/// The current user of the application, see `./Models/User.swift`
var currentUser: User? {
get {
guard let userData = self.object(forKey: #function) as? Data else { return nil }
return try? JSONDecoder().decode(User.self, from: userData)
}
set {
guard let newuser = newValue else { return }
if let userData = try? JSONEncoder().encode(newuser) {
self.set(userData, forKey: #function)
}
}
}
}
Transform the data into json data... #function is the function or value name i.e.
// For the case the user doesn't yet exist.
if ( UserDefaults.standard.currentUser == nil ) {
// Create a new user
user = User()
// Generate an id for the user, using a uuid.
user?.userId = UUID().uuidString
} else {
// otherwise, fetch the user from user defaults.
user = UserDefaults.standard.currentUser
}