Type 'Model' does not conform to protocol 'Decodable'/Encodable

Question

I can't figure out how I can fix this error.

If I remove @Published, it compiles everything correct but then I can't see the data in a cell in real time. Reading I saw that I need the var with @Published

import SwiftUI
import Combine

class TimeModel: Codable, Identifiable, ObservableObject {
    
    @Published var id: UUID = UUID()
    @Published var nome : String
    @Published var time : String
    
    func aggiornaUI() {
        DispatchQueue.main.async {
            self.objectWillChange.send()
        }
    }

    init(nome: String, time: String) {
        self.nome = nome
        self.time = time
    }
    
}

Update: ok thanks I check now but the error remain

        HStack {
            Text("\(timeString(from: Int(TimeInterval(remainingSeconds))))")
                .onReceive(timer) { _ in
                    if isCounting && remainingSeconds > 0 {
                        remainingSeconds -= 1
                    }
                }

error:

Instance method 'onReceive(_:perform:)' requires that 'TimeModel' conform to 'Publisher'

Answer 1

A @Published property with type, let's say, String , are of type Published<String> . And apparently, that type is not Codable .

You can solve this by writing custom encode and decode functions. That's not difficult; it's only some extra lines of code. Please see the documentation on Codable for some examples.

Here is an example for your case:

class TimeModel: Codable, Identifiable, ObservableObject {
    @Published var id: UUID = UUID()
    @Published var nome : String
    @Published var time : String
    
    func aggiornaUI() {
        DispatchQueue.main.async {
            self.objectWillChange.send()
        }
    }
    
    init(nome: String, time: String) {
        self.nome = nome
        self.time = time
    }
    
    enum CodingKeys: String, CodingKey {
        case id
        case nome
        case time
    }
    
    func encode(to encoder: Encoder) throws {
        var container = encoder.container(keyedBy: CodingKeys.self)
        try container.encode(id, forKey: .id)
        try container.encode(nome, forKey: .nome)
        try container.encode(time, forKey: .time)
    }
    
    required init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: CodingKeys.self)
        id = try container.decode(UUID.self, forKey: .id)
        nome = try container.decode(String.self, forKey: .nome)
        time = try container.decode(String.self, forKey: .time)
    }
}

This should work, but I can't really test it because I don't know the rest of your code.