Re-Ordering List Sections SwiftUI

Question

I have a simple List with sections that are stored inside an ObservableObject. I'd like to reorder them from another view. I have this working, and it re-orders the list sections but when you close out the app, it doesn't save the order you moved the list sections.

I want it to save the state after you re-order the sections, when I close out the app it goes back to the normal order.

class ViewModel: ObservableObject {
    @Published var sections = ["S1", "S2", "S3", "S4"]
    
    func move(from source: IndexSet, to destination: Int) {
        sections.move(fromOffsets: source, toOffset: destination)
    }
}

struct ContentView: View {
    @ObservedObject var viewModel = ViewModel()
    @State var showOrderingView = false

    var body: some View {
        VStack {
            Button("Reorder sections") {
                self.showOrderingView = true
            }
            list
        }
        .sheet(isPresented: $showOrderingView) {
            OrderingView(viewModel: self.viewModel)
        }
    }

    var list: some View {
        List {
            ForEach(viewModel.sections, id: \.self) { section in
                Section(header: Text(section)) {
                    ForEach(0 ..< 3, id: \.self) { _ in
                        Text("Item")
                    }
                }
            }
        }
    }
}

struct OrderingView: View {
    @ObservedObject var viewModel: ViewModel

    var body: some View {
        NavigationView {
            List {
                ForEach(viewModel.sections, id: \.self) { section in
                    Text(section)
                }
                .onMove(perform: viewModel.move)
            }
            .navigationBarItems(trailing: EditButton())
        }
    }
}

You have to add a variable to the Model that saves an index. They sort by the index — lorem ipsum, Jun 23 '21 at 09:50
Does this answer your question? [SwiftUI reorder CoreData Objects in List](https://stackoverflow.com/questions/59742218/swiftui-reorder-coredata-objects-in-list) — lorem ipsum, Jun 23 '21 at 09:52

score 0 · Answer 1 · answered Jun 23 '21 at 08:58

There are quite some options you have here. What you need in order for your app to save the states in-between sessions is data persistence.

There are several options to your disposal:

Core Data Recommended option to save app data.
User Defaults Older implementation and only suitable for some cases. Recommended to save for e.g. User in app settings.
Databases. There are a lot of options here. Your own database, Firebase etc.

Re-Ordering List Sections SwiftUI

1 Answers1