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?
}

score 2 · Accepted Answer · answered Nov 10 '19 at 13:12

2

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!

answered Nov 10 '19 at 13:12

emrcftci

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Hi,Emre Ciftci, I have one error: "Referencing instance method 'encode' on 'Array' requires that 'reisdelen' conform to 'Encodable'". Do you know how to fix this? – Dani Kemper Nov 10 '19 at 15:12
Simply you can conform ‘Codable’ protocol instead of Decodable. ‘Codable’ is the mix of ‘Encodable’ and ‘Decodable’. – emrcftci Nov 10 '19 at 19:08

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

1 Answers1