NSPersistentCloudKitContainer

This happens automatically when you use NSPersistentCloudKitContainer. See https://developer.apple.com/videos/play/wwdc2019/202/?time=1291 at time 21:30.

I've seen that the documentation of NSPersistentCloudKitContainer has been updated after the WWDC with two new Type Properties: class let eventChangedNotification: NSNotification.Name and class let eventNotificationUserInfoKey: String I think that are related to your question but I haven't tried them. I'm looking for this feature from the last year and I hope that in iOS 14 it will be implemented.

My two cents... My Core Data implementation for SwiftUI using the new App and Scene protocols and Window container! Credit to: mtsrodrigues for how to deal with change of Scene in his answer in this thread. KrakenDev's article on how to write a one line singleton My SwiftUI App... import SwiftUI @main struct YourApp: App { @Environment(.scenePhase) private var scenePhase @StateObject private var persistentStore = PersistentStore.shared var body: some Scene { WindowGroup { ContentView() .environment(.managedObjectContext, persistentStore.context) } .onChange(of: scenePhase) { phase in switch phase { case .active: print((#function) REPORTS - App change of scenePhase to ACTIVE) case .inactive: print((#function) REPORTS - App change of scenePhase to INACTIVE) case .background: print((#function) REPORTS - App change of scenePhase to BACKGROUND) savePersistentStore() @unknown default: fatalError((#function) REPORTS - fatal error in switch statement for .onChange modifier) } } } func savePersistentStore() { persiste

So for any passers-by that are interested in how I eventually achieved this... (Credit to mtsrodrigues for how to deal with change of Scene in his answer in this thread... https://developer.apple.com/forums/thread/650876) My Core Data implementation for SwiftUI and the new App and Scene protocols and Window container! My SwiftUI App... struct MyApp: App { @Environment(.scenePhase) private var scenePhase @StateObject private var persistentStore = PersistentStore.shared var body: some Scene { WindowGroup { ContentView() .environment(.managedObjectContext, persistentStore.context) } .onChange(of: scenePhase) { phase in switch phase { case .active: print((#function) REPORTS - App change of scenePhase to ACTIVE) case .inactive: print((#function) REPORTS - App change of scenePhase to INACTIVE) case .background: print((#function) REPORTS - App change of scenePhase to BACKGROUND) savePersistentStore() @unknown default: fatalError((#function) REPORTS - fatal error in switch statement for .onChange modifier) } } } func

I was able to fix this by moving my data store into its own class and using the same thing for both the app and previews: import CloudKit import CoreData import Foundation class DataStore { static let shared = DataStore() lazy var persistentContainer: NSPersistentContainer = { let container = NSPersistentCloudKitContainer(name: Structure) container.loadPersistentStores(completionHandler: { _, error in if let error = error { fatalError(Unresolved error (error)) } let context = container.viewContext context.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy context.automaticallyMergesChangesFromParent = true // other setup here }) return container }() func saveContext() { let context = persistentContainer.viewContext if context.hasChanges { do { try context.save() } catch { fatalError(Unresolved error (error)) } } } }