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NSPersistentCloudKitContainer

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NSPersistentCloudKitContainer - Import failed with error: Error Domain=NSCocoaErrorDomain Code=4864
The NSPersistentCloudKitContainer synchronization between core data and iCloud was working fine with phone 15.1. Connected a new iPhone iOS 15.5, it gives error: CoreData: debug: CoreData+CloudKit: -[NSCloudKitMirroringDelegate managedObjectContextSaved:](2504): : Observed context save: - 2022-12-05 13:32:28.377000-0600 r2nr[340:6373] [error] error: CoreData+CloudKit: -[NSCloudKitMirroringDelegate _importFinishedWithResult:importer:](1245): : Import failed with error: Error Domain=NSCocoaErrorDomain Code=4864 *** -[NSKeyedUnarchiver _initForReadingFromData:error:throwLegacyExceptions:]: incomprehensible archive (0x53, 0x6f, 0x6d, 0x65, 0x20, 0x65, 0x78, 0x61) UserInfo={NSDebugDescription=*** -[NSKeyedUnarchiver _initForReadingFromData:error:throwLegacyExceptions:]: incomprehensible archive (0x53, 0x6f, 0x6d, 0x65, 0x20, 0x65, 0x78, 0x61)} CoreData: error: CoreData+CloudKit: -[NSCloudKitMirroringDelegate _importFinishedWithResult:importer:](1245): : Import failed with error: Error Domain=NSCocoaErro
Topic: App & System Services SubTopic: iCloud & Data Tags:
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1.1k
Dec ’22
Reply to SwiftData with shared and private containers
SwiftData + CloudKit public or shared database isn't supported today. If that is critical to your app, I suggest that you file a feedback report to voice your need. The framework, including the new DataStore API, doesn't provide supports in that regard. You can choose to implement your own way, similar to what NSPersistentCloudKitContainer does, but that will be obviously very involved. I'd probably stick with NSPersistentCloudKitContainer, if I do need the integration with CloudKit public or shared database. Best, —— Ziqiao Chen  Worldwide Developer Relations.
Topic: UI Frameworks SubTopic: SwiftUI Tags:
Jun ’24
Reply to SwiftData and CloudKit
The original post had been a year ago, and had run out of my radar since then, until this new post brought this back, thanks to @jenyalebid. If simply creating a SwiftData model container with CloudKit integration, which kicks off the initialization of NSPersistentCloudKitContainer under the hood, causes the hang, I'd suggest that you start with filing an actionable feedback report, because the initialization is not supposed to be a long task. SwiftData + CloudKit integration is based on NSPersistentCloudKitContainer, and so folks can follow the tips described in the following technote to analyze if there is anything goes wrong in the initialization phase: TN3163: Understanding the synchronization of NSPersistentCloudKitContainer If somebody can share a minimal project, with detailed steps, that reproduces the issue, I'd be able to take a look as well. The orignal post does contain a link, but it has been a year, and I am not sure if the issue is the same. Best, —— Ziqiao Chen  Wor
Topic: App & System Services SubTopic: iCloud & Data Tags:
Aug ’25
Public Database delete records (NSPersistentCloudKitContainer)
As I understood there is no built-in mechanism to propagate deletion operations to other devices automatically (CoreData + CloudKit - public database), in order to delete or simulate a deletion do I have to add an attribute to the entities I create in order to simulate a tombstone? and if so I would never really delete the items? or if I do delete them how would I do it? I watched WWDC20 however is still not clear for me how to implement it
Topic: App & System Services SubTopic: iCloud & Data Tags:
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402
Jun ’23
Reply to CoreData + CloudKit
I'd firstly point you the following technotes, which I believe will give you the whole picture about how Core Data + CloudKit works: TN3163: Understanding the synchronization of NSPersistentCloudKitContainer TN3164: Debugging the synchronization of NSPersistentCloudKitContainer TN3162: Understanding CloudKit throttles Concretely to your questions: What are the solutions I have when the user first loads the app? How to force CoreData to query directly cloudKit? There is no API for an app to speed up the initial synchronization as of today. If there is a lot of data on the server, the synchronization will indeed take long time. I'd suggest that you file a feedback report against that. There is no API to force CoreData to import from CloudKit, and that is as-designed, as discussed in the technotes mentioned above. Does CoreData + CloudKit + NSPersistentCloudKitContainer will download the whole CloudKit database in my local, is that good???? When using NSPersistentCloudKitContainer
Topic: App & System Services SubTopic: iCloud & Data Tags:
Jan ’25
Reply to CloudKit + CoreData: Now how do I take advantage of CloudKit user-to-user sharing without losing CoreData + CloudKit synchronization?
Yes, It is not supported and you can use it, but have to write some extra code can be read as either saying the same thing, or contradicting each other, and after spending some hours looking through forums and documentation, without more context your intended meaning of NSPersistentCloudKitContainer does not yet support sharing isn't obvious to me. Contributing to my confusion, about a year ago the answer given included - https://developer.apple.com/forums/thread/117938?answerId=376835022#376835022: NSPersistentCloudKitContainer does not support sharing.... and As others have (correctly) pointed out, NSPersistentCloudKitContainer maintains a specific zone in the private database, and therefore will never see any shared zones owned by other users. Three weeks ago this answer - https://developer.apple.com/forums/thread/651651?answerId=616641022#616641022 also seems to say no: NSPersistentCloudKitContainer only supports the private database and the public database. If you wan
Topic: App & System Services SubTopic: iCloud & Data Tags:
Jul ’20