NSPersistentCloudKitContainer

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)) } } } }

I've found the solution. On the NSPersistentCloudKitContainer we have to simply call persistentContainer.record(for: object.objectID) where object is NSManagedObject

No, unfortunately if you hadn't set true for key NSPersistentHistoryTrackingKey, they will never get it to cloud, they will stay only in your device. A workaround that I used and worked fine, is to add a property to all entities (I used cloudReady: Bool, and at the first run of the app, after you adopt NSPersistentCloudKitContainer, change that property to true for all entities. This will force iCloud to sync those objects.

This thread provides an example of a SwiftUI + Core Data setup: https://developer.apple.com/forums/thread/650876 To clarify some terms: Core Data is a framework for local persistence and CloudKit can be seen as a transport technology that deals with storing data in iCloud. If you want to store objects from Core Data in iCloud, you can implement the syncing behavior on your own or make use of NSPersistentCloudKitContainer, a class that automatically mirrors changes in a local Core Data container to iCloud and keeps each device up-to-date.

@micho2, to achieve CloudKit integration you should be able to change the persistentContainer property like so... var persistentContainer: NSPersistentContainer = { ttttlet container = NSPersistentCloudKitContainer(name: SampleApp) tttttt // change this line container.loadPersistentStores(completionHandler: { (storeDescription, error) in if let error = error as NSError? { ttttttttfatalError(Unresolved error (error), (error.userInfo)) } }) ttttcontainer.viewContext.automaticallyMergesChangesFromParent = truetttttttt // add this line return container }() although I've not tested this yet!

CKDatabase.Scope is also used in other classes, such as CKDatabase. Introducing a new scope class just for NSPersistentCloudKitContainer wouldn't have been a good idea.

NSPersistentCloudKitContainer only supports the private database and the public database. If you want to let your users share data with each other, you need to use the CKShare and CK operations API.