Dictionary save error "SwiftValue encodeWithCoder:]: unrecognized selector sent to instance"

Question

I want to save a save a dictionary, but I keep getting this error message: "SwiftValue encodeWithCoder:]: unrecognized selector sent to instance". This is how I try to save the Dictionary:

func savePlaces(){
     let placesData = NSKeyedArchiver.archivedData(withRootObject: Resultaat?.reisdelen)
     UserDefaults.standard.set(placesData, forKey: "Reis")
}

How I try to load the dictionary:

var Reis = [reisdelen]()
func loadPlaces(){
     let placesData = UserDefaults.standard.object(forKey: "Reis") as? NSData

     if let placesData = placesData {
         let placesArray = NSKeyedUnarchiver.unarchiveObject(with: placesData as Data) as? [reisdelen]

         if let placesArray = placesArray {
             Reis = placesArray
             TableView.reloadData()
         }
     }
 }

My Struct:

struct reismogelijkheden: Decodable {
    let reisdelen: [reisdelen]?
    let reistijd: reistijd?
    let reistijdActueel : reistijdActueel?
    let aantalOverstappen: Int?
    let vertrektijd: String?
    let vertrektijdVertraging: vertrektijdVertraging?
    let aankomsttijd: String?
}

struct reisdelen: Decodable {
    let vervoerder: String?
    let richting: String?
    let treinnummer: String?
    let lijn: String?
    let stops: [stops]?
    let modaliteit: modaliteit?
    let travelTimeInMinutes: Int?
    let travelDistanceInMeters: Int?
}

Answer 1

You can save the model to UserDefaults like this:

• Firstly you should create an instance of your model

• Then you can save your model to UserDefaults like:

  let encoder = JSONEncoder()
  if let encoded = try? encoder.encode(modelInstance) {
      let defaults = UserDefaults.standard
      defaults.set(encoded, forKey: "Reis")
  }
  

  You can get model from UserDefaults like this

  if let savedItem = defaults.object(forKey: "Reis") as? Data {
      let decoder = JSONDecoder()
      if let loadedItem = try? decoder.decode(YourModel.self, from: savedItem) {
          print(loadedItem)
      }
  }
  

I hope it is the answer you try to find.

Enjoy!