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“NSPersistentCloudKitContainer”

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Error when calling initializeCloudKitSchema

I am trying to setup my CloudKit schema from CoreData using the NSPersistentCloudKitContainer but getting an error when calling try container.initializeCloudKitSchema() The error: Error Domain=NSCocoaErrorDomain Code=134060 A Core Data error occurred. UserInfo={encounteredErrors=( Error Domain=NSCocoaErrorDomain Code=134406 Request '07443E71-32AC-4E63-A163-AAF940FE1AD6' was aborted because the mirroring delegate never successfully initialized due to error: UserInfo={NSLocalizedFailureReason=Request '07443E71-32AC-4E63-A163-AAF940FE1AD6' was aborted because the mirroring delegate never successfully initialized due to error: } )} My container is iCloud., and is reflected in the Entitlement file.

App & System Services iCloud & Data CloudKit

1.1k

Aug ’22

Core Data Entity Inside Another Entity

So I have an entity in my core data model called recipe. I need to create another entity containing a recipe and a date that the recipe is assigned to. Can I do this similar to the way I've done it in the image and just save a Recipe object in the initialization of PlannedRecipe object in the Persistence file? Basically I just need to know how to add a entity in an entity using this core data model and persistence file. Persistence file: import CoreData struct PersistenceController { static let shared = PersistenceController() let container: NSPersistentCloudKitContainer init(inMemory: Bool = false) { container = NSPersistentCloudKitContainer(name: ReciPrep) if inMemory { container.persistentStoreDescriptions.first!.url = URL(fileURLWithPath: /dev/null) } container.loadPersistentStores(completionHandler: { (storeDescription, error) in if let error = error as NSError? { fatalError(Unresolved error (error), (error.userInfo)) } }) container.viewContext.automaticallyMergesChangesFromParent = tru

UI Frameworks SwiftUI Swift Core Data SwiftUI

1.2k

Jun ’22

CloudKit and CoreData public database

Core Data with CloudKit uses a specific record zone in the CloudKit private database, which is accessible only to the current user.It's not possible to use CloudKit and CoreData with the CloudKit public database? Here is my scenario.- I have an application with two core data stores.- The first store should be synced with the public CloudKit database and NOT updated by the user.- The second store should be synced with the private CloudKit database and updated by the user.lazy var persistentContainer: NSPersistentCloudKitContainer = { let container = NSPersistentCloudKitContainer(name: MyAppName) // Create a store description for the first store let firstStoreLocation = URL(fileURLWithPath: /path/to/first.store) let firstStoreDescription = NSPersistentStoreDescription(url: firstStoreLocation) firstStoreDescription.configuration = First // Create a store descpription for the second store let secondtoreLocation = URL(fileURLWithPath: /path/to/second.store) let secondStoreDescription = NSPersiste

App & System Services Core OS iOS

4.7k

Aug ’19

Share sheet configuration

I'm trying to configure the share sheet. My project uses techniques from the Apple Sample project called CoreDataCloudKitShare which is found here: https://developer.apple.com/documentation/coredata/sharing_core_data_objects_between_icloud_users# In this sample code there's a PersistenceController which is an NSPersistentCloudKitContainer. In the PersistenceController+SharingUtilities file there are some extensions, and one of them is this: func configure(share: CKShare, with photo: Photo? = nil) { share[CKShare.SystemFieldKey.title] = A cool photo } This text A cool photo seems to be the only bespoke configuration of the share sheet within this project. I want to have more options to control the share sheet, does anyone know how this might be achieved? Thank you!

UI Frameworks SwiftUI

681

Nov ’24

Switching from production to development database

Hello! I have a live app in the appstore which uses NSPersistentCloudKitContainer. When I was working on the app, whatever data was created while testing was reflecting in the Development section of the CloudKitDashboard. Then, when time came for releasing the app, I had pushed my schema to production and everything has been working well. Recently, I have been working to make some changes in my code and while testing I realised that that I am being pointed to Production. Now how do I move back to using Development while working on the app. I have tried changing values of in .entitlement file. But it still does not give me what I want. Below is my entitlement values: aps-environment development com.apple.developer.icloud-container-environment Development com.apple.developer.icloud-container-identifiers Does anyone have any suggestions?

App & System Services iCloud & Data CloudKit Core Data

490

Jun ’21

CoreData: warning: CoreData+CloudKit

I use NSPersistentCloudKitContainer. It seems that it the data synced in iCloud after a few seconds. However, I get the following warnings in the console. I do not understand what is it for. CoreData: warning: CoreData+CloudKit: -[NSCloudKitMirroringDelegate _performSetupRequest:]_block_invoke(813): <NSCloudKitMirroringDelegate: 0x280b051e0>: Successfully set up CloudKit integration for store: <NSSQLCore: 0x280024a00> (URL: file:///private/var/mobile/Containers/Shared/AppGroup/89D9D17C-03DF-48E4-83C3-DB23A8FE0D6F/TestData.sqlite) CoreData: warning: CoreData+CloudKit: -[NSCloudKitMirroringDelegate checkAndScheduleImportIfNecessary:]_block_invoke(2033): <NSCloudKitMirroringDelegate: 0x280b051e0>: Scheduling automated import with activity: Could you please explain what is this warning for and what should I do to fix it?

App & System Services iCloud & Data CloudKit Core Data

1.8k

Jul ’20

Suspicious CloudKit Telemetry Data

Starting 20th March 2025, I see an increase in bandwidth and latency for one of my CloudKit projects. I'm using NSPersistentCloudKitContainer to synchronise my data. I haven't changed any CloudKit scheme during that time but shipped an update. Since then, I reverted some changes from that update, which could have led to changes in the sync behaviour. Is anyone else seeing any issues? I would love to file a DTS and use one of my credits for that, but unfortunately, I can't because I cannot reproduce it with a demo project because I cannot travel back in time and check if it also has an increase in metrics during that time. Maybe an Apple engineer can green-light me filing a DTS request, please.

App & System Services iCloud & Data CloudKit CloudKit Dashboard

158

Apr ’25

Core Data + CloudKit works for development but not production

I enabled Core Data + CloudKit for my MacOS and iOS app to allow sync between the two. I was able to test the sync during development and it's been syncing to My development database container just fine and I can fetch the changes from both my apps. However, once I distributed my app to test flight/app store, the Production database is not getting any activity at all. I did made sure I deploy my database schema to production per other troubleshooting post online. Am I missing any additional setup required for production? Below is my Persistence struct for reference (edited the App Name, using the the name of my app in actual file): static let shared = PersistenceController() let container: NSPersistentCloudKitContainer init(inMemory: Bool = false) { container = NSPersistentCloudKitContainer(name: App Name) // Only initialize the schema when building the app with the // Debug build configuration. #if DEBUG do { // Use the container to initialize the development schema. try container.initializ

App & System Services iCloud & Data CloudKit Core Data

922

Mar ’23

Core Data Records Not Syncing with CloudKit Dashboard

Hello everyone, I'm currently working on an iOS app using SwiftUI and Core Data, integrating CloudKit for data synchronization. I've set up my Core Data stack with NSPersistentCloudKitContainer, and everything appears to be working correctly locally. However, I'm not seeing any records appearing in the CloudKit Dashboard. This issue started occurring after transferring the Apple Developer account ownership and changing the CloudKit container. Here's a summary of my setup and what I've tried so far: Setup PersistenceController.swift import SwiftUI import Foundation import CoreData import CloudKit class PersistenceController { static let shared = PersistenceController() let container: NSPersistentCloudKitContainer init() { container = NSPersistentCloudKitContainer(name: Model) guard let description = container.persistentStoreDescriptions.first else { fatalError(No Descriptions found) } description.cloudKitContainerOptions = NSPersistentCloudKitContainerOptions(containerIdentifier: iCl

App & System Services iCloud & Data CloudKit Core Data CloudKit Dashboard

1.2k

Jul ’24

Cloudkit and CoreData Sync memory issue with image Data.

I have created a core data model in which i add images of binary data type with Allow external storage. I Sync it on iCloud with Cloudkit using NSPersistentCloudKitContainer. When it automatically sync it from cloud to other device or i uninstall the app and re install it. I have a memory crash as follow.<NSSQLSaveChangesRequestContext: 0x281ec8420> , *** NSAllocateMemoryPages(28317598) failed with userInfo of (null)Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** NSAllocateMemoryPages(28317598) failedI got this crash after updating to iOS 13.1 beta 2. I don't get this crash on simulator iOS 13.0 (It sync it succeccfully from cloud in simulator.)

App & System Services Core OS iOS

1.2k

Sep ’19

CloudKit Sync Complete Event/Notification

How does one know when the CloudKit data in a CoreData+CloudKit (NSPersistentCloudKitContainer) has been fully synchronized. UseCase would be a user starts the App on a second device, user deletes then reinstalls the App, another User accepts a share and the share needs to sync. Is the containerEventChanged Notification for 'import success' the definitive event? CoreData: CloudKit: CoreData+CloudKit: -[NSCloudKitMirroringDelegate _finishedRequest:withResult:](3403): Finished request: 729A742A-7F3B-42F1-B04C-72705D41FFEF with result: storeIdentifier: 79FA5848-A135-41B1-A36A-09F2F914D23D success: 1 madeChanges: 0 error: (null) As the sync could be time-consuming, is there a way to identify a single CloudKit record?

App & System Services iCloud & Data CloudKit Core Data

1.4k

Jan ’24

Cloudkit - Coredata and multiples database

Today, I'm working without cloudkit (all data are in a local Coredata), with one database on my Xcode project but with 2 containers on app.delegate : one for a test environment : with storeURL ---> test.sqlite one for a production environment : with storeURL --> production.sqlite Everything is ok, the test data, is really separate from production data. Now, I try to use cloudkit functions : I change NSPersistentContainer to NSPersistentCloudKitContainer it's working and I could use data on 2 iPads. BUT if I switch the test to the prod, now the data from test environnement is duplicate on the production environnement. what mistake am I making? How could I use my two storeURL with cloudkit coredata? Thanx for your help.

App & System Services iCloud & Data CloudKit Core Data

728

Jan ’22

CoreData error=134100 Failed to open the store

Hello, I'm using CoreData + CloudKit and I am facing the following error 134100 The managed object model version used to open the persistent store is incompatible with the one that was used to create the persistent store. All my schema updates are composed of adding optional attributes to existing entities, adding non-optional attributes (with default value) to existing entities or adding new entities Basically, only things that lightweight migrations can handle. Every time I update the schema, I add a new model version of xcdatamodel - who only has a single configuration (the Default one). And I also deploy the updated CloudKit schema from the dashboard. It worked up to v3 of my xcdatamodel, but started to crash for a few users at v4 when I added 16 new attributes (in total) to 4 existing entities. Then again at v5 when I added 2 new optional attributes to 1 existing entity. I'm using a singleton and here is the code: private func generateCloudKitContainer() -> NSPersistentCloudKitContainer { let

App & System Services iCloud & Data CloudKit Core Data

977

Feb ’25

Why? "CloudKit integration does not support unique constraints"

Hi, On iOS 14 beta 1-3 I was happily using a constraint on several entities in NSPersistentCloudKitContainer. The part of the app using this was essentially an RSS reader - two different devices were independently fetching news and no duplicates due to the constraints. Now on iOS14 beta 4 I'm receiving CloudKit integration does not support unique constraints, which means I've had to remove the constraints.. Now the app is subject to CloudKit sync vs RSS import timing issues.. if CloudKit syncs after the RSS import then there are duplicate items. What's the workaround for this please? It really should just work. Thanks, Andy

App & System Services iCloud & Data CloudKit Core Data

4.6k

Aug ’20

Reply to Core Data initialization causes app to deadlock on startup

Your crash report is only partially symbolicated. To be completely clear what happened in your app, you might consider fully symbolicating your report. The details of how to do so is covered in this article. Having said that, your crash report indicates that the main thread (thread 0) was blocked when SwiftUI initialized a tab view (frame 8). Your app got involved into the process (frame 4, 5), and eventually ran into _dispatch_once_wait (frame 3) and __ulock_wait (frame 0): Thread 0 name: Dispatch queue: com.apple.main-thread Thread 0 Crashed: 0 libsystem_kernel.dylib 0x1df207f70 __ulock_wait + 8 1 libdispatch.dylib 0x196334c3c _dlock_wait + 56 2 libdispatch.dylib 0x196367408 _dispatch_once_wait.cold.1 + 148 3 libdispatch.dylib 0x196334b98 _dispatch_once_wait + 60 4 MyApp 0x10047b7d4 0x100360000 + 1161172 5 MyApp 0x100563524 0x100360000 + 2110756 6 SwiftUI 0x19369cbd4 Tab<>.init<>(_:systemImage:value:content:) + 300 7 MyApp 0x1005628a8 0x100360000 + 2107560 8 SwiftUI 0x1931b5780 TabView.init(sele

App & System Services iCloud & Data

Aug ’25