SwiftData

SwiftData

SwiftData stores your model objects on disk. Mark a class @Model, add .modelContainer(for:) to your app's scene, and fetch in a view with @Query, which keeps the view up to date as the data changes. You insert, delete, and save through a ModelContext, which you get from @Environment(\.modelContext). Relationships, sorting, and filtering with #Predicate are built in.

Coming from UIKit, SwiftData is the successor to Core Data, and @Query does the job of NSFetchedResultsController. iOS 27 adds queries divided into sections, a ResultsObserver for watching results from outside a view, and @Attribute(.codable) for storing Codable values.

@Model
final class Trip {
    var name: String
    var date: Date
    init(name: String, date: Date) { self.name = name; self.date = date }
}

struct TripsScreen: View {
    @Query(sort: \Trip.date) private var trips: [Trip]      // stays current automatically
    @Environment(\.modelContext) private var context

    var body: some View {
        List(trips) { trip in Text(trip.name) }
            .toolbar {
                Button("Add") { context.insert(Trip(name: "New trip", date: .now)) }
            }
    }
}
// In the App:   WindowGroup { TripsScreen() }.modelContainer(for: Trip.self)

Persist your trips with SwiftData: add, edit, delete, and sort them. Then quit and relaunch the app and confirm the data is still there.

1. Which three pieces do you need in order to show persisted data in a view?
2. How does @Query keep a view up to date?
3. Where do you get the ModelContext, and what do you use it for?

• SwiftData
• Preserving your app’s model data across launches
• WWDC23: Meet SwiftData
• WWDC26: What’s new in SwiftData