iOS Decoding Data from UserDefaults

[Wizec]

I’m trying to decode a Data object from UserDefaults in a Swift Playgrounds project. Here’s my code:

import SwiftUI

struct Person: Identifiable, Encodable, Decodable {
    var id = UUID()
    var name = String()
}

struct ContentView: View {
    @State var people: [Person] = [
        Person(name: "Bob")
    ]
    
    init(){
        // decode peopleData from UserDefaults as [Person] into people variable
    guard let people = try? JSONDecoder().decode([Person].self, from: UserDefaults.standard.data(forKey: "peopleData") ?? [Person]())
    else { return }
    }
    
    var body: some View {
        VStack {
            Image(systemName: "person")
                .imageScale(.large)
                .foregroundColor(.accentColor)
            
            ForEach($people, id: \.id){ person in
                HStack{
                    TextField("enter name", text: person.name)
                        .frame(width: 150, height: 40, alignment: .leading)
                        .textFieldStyle(.roundedBorder)
                }
            }
        }
    }
}

I’m getting an error in the JSONDecoder line:

”Cannot convert value of type ‘[Person]’ to expected argument type Data”

I was trying to follow the information from the answer here:

Using @AppStorage for string map

How can I use @AppStorage for a string map in a SwiftUI app? This is what I want to do: @AppStorage("ratings") var ratings: [String: Double] = [] But this gives me the error message “No ...

stackoverflow.com

Just thought I’d post here in case someone has experience with this, or some idea of what I’m doing wrong. TIA!

 

[Wizec]

Looks like I got it working:

import SwiftUI

struct Person: Identifiable, Encodable, Decodable {
    var id = UUID()
    var name = String()
}

struct ContentView: View {
    @State var people: [Person]
    
    init(){
        // decode peopleData from UserDefaults as [Person] into people variable
        if let peopleData = UserDefaults.standard.object(forKey: "peopleData") as? Data{
            people = try! JSONDecoder().decode([Person].self, from: peopleData)
        }
        else {
            people = [
                Person(name: "Fred")
            ]
        }
    }
    
    var body: some View {
        VStack {
            Image(systemName: "person")
                .imageScale(.large)
                .foregroundColor(.accentColor)
            
            ForEach($people, id: \.id){ person in
                HStack{
                    Text("Name")
                        .padding(5)
                        .overlay(RoundedRectangle(cornerRadius: 4).stroke())
                    TextField("enter name", text: person.name)
                        .frame(width: 150, height: 40, alignment: .leading)
                        .textFieldStyle(.roundedBorder)
                }
            }
        }
    }
}