NSPersistentCloudKitContainer

If you are trying to use an App Group container to share a database between your iOS app and an WatchKit extension, that won't work because the iOS app runs on iPhone and the WatchKit extension runs on the paired watch, and an app ground container can't be cross devices. You will have to synchronize the data across the devices with your own code. As Nick points out, you can try with NSPersistentCloudKitContainer, you can also use CloudKit directly to synchronize the data you need. WatchConnectivity is not recommended if you want your watch app to be standalone.

You need to create a custom Core Data class and inject it into ContentView() I don‘t have a default file at hand but you can inject it like below let context = PersistentCloudKitContainer.persistentContainer.viewContext tt ContentView().environment(.managedObjectContext, context) Below my CloudKitContainer but you can simply change that to a regular PersistentContainer class import CoreData public class PersistentCloudKitContainer { tt tt// MARK: - Define Constants / Variables ttpublic static var context: NSManagedObjectContext { ttttreturn persistentContainer.viewContext tt} tt tt// MARK: - Initializer ttprivate init() {} tt tt// MARK: - Core Data stack ttpublic static var persistentContainer: NSPersistentCloudKitContainer = { tt ttttlet container = NSPersistentCloudKitContainer(name: Container_Name) ttttcontainer.loadPersistentStores(completionHandler: { (storeDescription, error) in ttttttif let error = error as NSError? { ttttttt ttttttttfatalError(Unresolved error (error), (error.userInf

You can use the feedback assistant to file bugs against NSPersistentCloudKitContainer. Include the following: A sysdiagnose from all of the participating devices The persistent store files from all of the participating devices If your dataset is large, a detailed accounting of the affected records and the mutations made to them from each device (as well as you recall, history tracking is the truth)

You can use NSPersistentCloudKitContainer, but you have to implement the code for sharing manually. Here's a great description of what's needed along with sample code: https://developer.apple.com/documentation/cloudkit/sharing_cloudkit_data_with_other_icloud_users You can retrieve CKRecord objects from NSPersistentCloudKitContainer using https://developer.apple.com/documentation/coredata/nspersistentcloudkitcontainer/3141668-recordformanagedobjectid?language=objc

I think this is expected. NSPersistentCloudKitContainer saves data to CloudKit and it encounters this error the first time it saves something to the cloud. It automatically creates the zone and it won't encounter this error on subsequent requests. That's why you're only seeing this error once per user.

The data should still be stored in iCloud and NSPersistentCloudKitContainer should take care of downloading data that is in CloudKit. Could you please post the setup of your Core Data stack?

Yes, NSPersistentCloudKitContainer doesn't support sharing, you have to implemented that code manually. Here's a great walkthrough along with some sample code: https://developer.apple.com/documentation/cloudkit/sharing_cloudkit_data_with_other_icloud_users You can obtain an NSManagedObject's underlying CKRecord using https://developer.apple.com/documentation/coredata/nspersistentcloudkitcontainer/3141668-record Basically, you need to create a CKShare for each record you'd like to share. Don't forget to setup a CKDatabaseSubscription to get notified about changes. After changing the record, receivers of the share need to store it back to the shared database (and not to their private database, unless they're the owner of the record).

I'm using an almost identical CoreData stack as to what was shown in the WWDC 2019 Posts demo app. Here's the code: import Foundation import CoreData // MARK: - Core Data Stack /** The main Core Data stack setup including history processing./ class CoreDataStack { tt/** ttttA persistent container that can load cloud-backed and non-cloud stores. tt */ ttlazy var persistentContainer: NSPersistentCloudKitContainer = { tttt tttt// Create a container that can load CloudKit-based stores ttttlet container = NSPersistentCloudKitContainer(name: MyCoreDataApp) tttt tttt// Enable history tracking and remote notifications ttttguard let description = container.persistentStoreDescriptions.first else { ttttttfatalError(###(#function): Failed to retrieve a persistent store description.) tttt} ttttdescription.setOption(true as NSNumber, forKey: NSPersistentHistoryTrackingKey) ttttdescription.setOption(true as NSNumber, forKey: NSPersistentStoreRemoteChangeNotificationPostOptionKey) tttt ttttcontainer.loadPer