Data Persistence with SwiftData

Mar 19 2025 · Swift 5.10, iOS 17, ipadOS 17, macOS 15, visionOS 1.2, Xcode 15

Lesson 05: SwiftData, Migrations & Working with Core Data

From Core Data to SwiftData Demo

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Moving From Core Data to SwiftData

In the Starter folder, you’ll find another app called CoreData_SwiftUI. This a simple SwiftUI app that uses Core Data as the persistence framework. You’ll convert this app to use **SwiftData** with the knowledge you’ve gained in this course.

import Foundation
import SwiftData

class UserInfoModel {
  var firstName: String?
  var lastName: String?
  var gender: String?

}

init(
  firstName: String? = nil,
  lastName: String? = nil,
  gender: String? = nil
) {
  self.firstName = firstName
  self.lastName = lastName
  self.gender = gender
}

import Foundation
import SwiftData

@Model
class UserInfoModel {
  var firstName: String?
  var lastName: String?
  var gender: String?

  init(
    firstName: String? = nil,
    lastName: String? = nil,
    gender: String? = nil
  ) {
    self.firstName = firstName
    self.lastName = lastName
    self.gender = gender
  }
}

extension UserInfoModel {
  @MainActor
  static var preview: ModelContainer {
    do {
      let container = try ModelContainer(for: UserInfoModel.self, configurations: ModelConfiguration(isStoredInMemoryOnly: true))

      let user1 = UserInfoModel(
        firstName: "Taylor",
        lastName: "SwiftData",
        gender: "Female"
      )
      let user2 = UserInfoModel(
        firstName: "Joe",
        lastName: "Smith",
        gender: "Male"
      )
      let user3 = UserInfoModel(
        firstName: "Jane",
        lastName: "Doe",
        gender: "Female"
      )

      container.mainContext.insert(user1)
      container.mainContext.insert(user2)
      container.mainContext.insert(user3)

      return container
    } catch {
      print("Fatal Error: Could not create preview modelContainer.")
      // Return an empty or default ModelContainer
      do {
        return try ModelContainer(for: UserInfoModel.self, configurations: ModelConfiguration(isStoredInMemoryOnly: true))
      } catch {
        fatalError("Failed to create fallback ModelContainer.")
      }
    }
  }
}

@main
struct CoreData_SwiftUIApp: App {
 // 1. delete the persistenceController
 let persistenceController = PersistenceController.shared

 var body: some Scene {
  WindowGroup {
    UserListView()
      // 2. delete the environment
      .environment(
        \.managedObjectContext,
          persistenceController.container.viewContext
      )
  }
 }
}


UserListView()
  .modelContainer(for: [UserInfoModel.self])

@Environment(\.modelContext) private var modelContext

@Query(
  sort: \UserInfoModel.firstName,
  order: .forward
) var users: [UserInfoModel]

.modelContainer(UserInfoModel.preview)

// Update the environment managedObjectContext to this
@Environment(\.modelContext) private var modelContext

/* Replace the current addItem code
let newItem = UserInfo(context: modelContext)
newItem.firstName = firstName
newItem.lastName = lastName
newItem.gender = gender

// remove the do-catch block
*/

let newUser = UserInfoModel(
  firstName: firstName,
  lastName: lastName,
  gender: gender
)
modelContext.insert(newUser)
dismiss()

.sheet(isPresented: $showingAddUser) {
  UserInfoView()
}

CoreData_SwiftUI.sqlite
CoreData_SwiftUI.sqlite-shm
CoreData_SwiftUI.sqlite-wal

var container: ModelContainer

init() {
  do {
    let storeURL = URL.applicationSupportDirectory.appending(
      path: "CoreData_SwiftUI.sqlite"
    )
    let config = ModelConfiguration(url: storeURL)
    container = try ModelContainer(
      for: UserInfoModel.self,
      configurations: config
    )
  } catch {
    fatalError("Failed to configure SwiftData container.")
  }
}

print(URL.applicationSupportDirectory.path(percentEncoded: false))
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