SwiftUI: Storing an Array in UserDefaults

user_14426684 0
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i am desperate at a point that is probably very easy to solve. It is no problem for me to store a bool value in UserDefaults. see the attached code. But I can't manage to change it in a way that I can store multiple toggles with one array.

Anybody got an idea?

import SwiftUI
import Foundation

struct ContentView: View {
    
    @ObservedObject var settings = settingsStore()
    
    var body: some View {
        VStack{
            
            Toggle (isOn: self.$settings.isFavorit) {
                Text("")
                }
        }
        .background(self.$settings.isFavorit.wrappedValue ? Color.green : Color.red)
    }
}


class settingsStore: ObservableObject{
    
    
    @Published var isFavorit: Bool = UserDefaults.standard.bool(forKey: "isFavorit"){
        didSet {
            UserDefaults.standard.setValue(self.isFavorit, forKey: "isFavorit")
        }
    }
    
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        /*@START_MENU_TOKEN@*/Text("Hello, World!")/*@END_MENU_TOKEN@*/
    }
}
swiftui swift
1 Answers

First don't use UserDefault's setValue method. You should use func set(_ value: Any?, forKey defaultName: String). You can then use UserDefault's method func array(forKey defaultName: String) -> [Any]? to get the value and cast it to [Bool]

UserDefaults.standard.set([true, false, true], forKey: "bools")
UserDefaults.standard.array(forKey: "bools") as? [Bool]  // [true, false, true]

edit/update:

You can create an isFavorite computed property extending UserDefaults with a getter and a setter to persist your array of booleans. Then you can simply use that value to initialize your published property and update its value when it changes:

extension UserDefaults {
    var isFavorite: [Bool] {
        get {
            array(forKey: "isFavorit") as? [Bool] ?? []
        }
        set {
            set(newValue, forKey: "isFavorit")
        }
    }
}

class SettingsStore: ObservableObject{
    @Published var isFavorit: [Bool] = UserDefaults.standard.isFavorite {
        didSet {
            UserDefaults.standard.isFavorite = self.isFavorit
        }
    }
}
user_23038650
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