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“NSPersistentCloudKitContainer”

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How to import data from iPhone system File to the app other than the app's iCloud at first through Share Extension?

The local data in iPhone system File is inserted to the app core data through Share Extension. The app uses NSPersistentCloudKitContainer to sync core data. But when importing local data from iPhone local File, the data always go to iCloud of the app at first and then syncing data to the app from iCloud. This leads to that the app cannot import data when the iCloud drive is closed or the iCloud is full. Is there any way to import data to the app other than to the app's iCloud at first?

App & System Services Core OS iOS Extensions Core Data iCloud Drive

879

Aug ’20

Core Data + Cloudkit not synching

I have a Core Data + Couldkit App where any changes made on other device is not synched. I had to call the fetch method again refresh the data. I even added the necessary lines, let container = NSPersistentCloudKitContainer(name: myappcontainername) container.viewContext.automaticallyMergesChangesFromParent = true The following are the CoreData logs after making a change, CoreData+CloudKit: -[NSCloudKitMirroringDelegate finishedAutomatedRequestWithResult:](2119): Finished request '<NSCloudKitMirroringExportRequest: 0x6> -UUID' with result: <NSCloudKitMirroringResult: 0x> success: 1 madeChanges: 1 error: (null) What else should I be doing to make this work?

UI Frameworks UIKit Swift CloudKit Core Data UIKit

684

Jul ’20

Old local persistent store to new CloudKit store- lightweight migration

I have a new model which syncs to cloudkit. I'have to migrate my old core data store which is local to the new model which will store in cloudkit. I'm not sure how to perform this migration. The container is initialised correctly and the Mapping Model is mapping my entities and attributes correctly. There are no errors. Yet, I do not see my old records upon fetching. I found this lines of code here... NSDictionary *optionsDictionary = [[NSDictionary alloc] initWithObjectsAndKeys: [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, [NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption, <#Ubiquitous content name#>, NSPersistentStoreUbiquitousContentNameKey, nil]; However, I'm not sure where to add it. Since, I had created a new project folder with core data + CloudKit (and imported the old model), this is the method i got in AppDelegate which initialises the store... - (NSPersistentCloudKitContainer *)persistentContainer { // The persistent container for t

App & System Services iCloud & Data CloudKit Core Data

766

Dec ’21

Not receiving Persistent Store Remote Change Notification.

Before the code... CloudKit, background mode (remote notifications) and push notifications are added to Capabilities. Background sync is working fine and view loads current store on manual fetch. Code that initialises the persistent container in app delegate... - (NSPersistentCloudKitContainer *)persistentContainer { // The persistent container for the application. This implementation creates and returns a container, having loaded the store for the application to it. @synchronized (self) { if (_persistentContainer == nil) { _persistentContainer = [[NSPersistentCloudKitContainer alloc] initWithName:@Expenses]; [_persistentContainer loadPersistentStoresWithCompletionHandler:^(NSPersistentStoreDescription *storeDescription, NSError *error) { if (error != nil) { __block NSPersistentStoreDescription *sDescription = storeDescription; dispatch_async(dispatch_get_main_queue(), ^(){ [sDescription setOption:[NSNumber numberWithBool:YES] forKey:@PersistentHistoryTracking]; [sDescription setOption:[NSNu

App & System Services iCloud & Data CloudKit Core Data

1.8k

Aug ’22

Migrating iOS 13 app to 14: how to manage AppDelegate context code for CoreData?

I'm in the middle of updating my app to only support iOS 14+ and am moving to the new @main app structure. I'm trying to figure out how to deal with code in my App and Scene Delegate: mainly code related to Core Data and CloudKit persistent container. Stuff like lazy var persistentContainer: NSPersistentCloudKitContainer = {...} and let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext context.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy context.automaticallyMergesChangesFromParent = true Where do I put this kind of stuff in the new @main world?

App & System Services Core OS iOS Core Data

1.2k

Jul ’20

Possible to override background push limits during development?

The video discusses limits to background pushes. I'm unable to finish developing my app that uses NSPersistentCloudKitContainer on iOS 14 because I believe background push notifications are being limited by the system so I am unable to test how the app behaves when it is suspended and a background push arrives. In fact I cannot get any background pushes to arrive at all, however pushes do arrive when the app is running in the foreground. Is there perhaps a development entitlement or launch param to override all limits so I can finish my app? And if not, can this feature be added please?

App & System Services Core OS WWDC20 wwdc20-10063 Background Tasks APNS

1.1k

Sep ’20

Cannot see records in the iCloud Production environment

I'm attempting to use Core Data + CloudKit to persist user's data with the NSPersistentCloudKitContainer class. I'm able to see created records in the Development environment but records won't show in the Production environment. With just this brief description, what could be the issue? Notes I have deployed the schema to the Production environment. I'm using the same device and iCloud account for both environments My Apple ID is the same for my personal and dev account. I'm attempting to add records to Production via a TestFlight build The iCloud toggle for the app is ON. What are some initial thoughts as to why there is a sync issue?

App & System Services iCloud & Data CloudKit Core Data

512

Oct ’21

Avoid Duplicate Records with CloudKit & CoreData

When my app starts it loads data (of vehicle models, manufacturers, ...) from JSON files into CoreData. This content is static. Some CoreData entities have fields that can be set by the user, for example an isFavorite boolean field. How do I tell CloudKit that my CoreData objects are 'static' and must not be duplicated on other devices (that will also load it from JSON files). In other words, how can I make sure that the CloudKit knows that the record created from JSON for vehicle model XYZ on one device is the same record that was created from JSON on any other device? I'm using NSPersistentCloudKitContainer.

App & System Services iCloud & Data iOS CloudKit Core Data

3.4k

Feb ’22

Sync for the first time the CloudKit data

My app backup the data to iCloud or sync with user device through the user iCloud account using NSPersistentCloudKitContainer privateDataBase. The main problem is, when user install the app I need to know if user has data in iCloud or not according this information, I let user to setup account or fetch the existing account, since it takes too long to fetch with local CoreData, I am trying to find a way to fetch directly from iCloud through CloudKit, since I am new in CloudKit, I don't know how to fetch data from CloudKit any help appreciate.

App & System Services iCloud & Data CloudKit iCloud Drive

738

May ’22

Changing relationship delete rule & CloudKit

Hi, any side effect to be aware of when changing a core data relationship delete rule from Null to Cascade? I NSPersistentCloudKitContainer to handle CloudKit sync in case that's relevant. It doesn't look like any migration is required, and the cloudkit schema doesn't change so it seems there's nothing to do on the cloudkit-side either. However I'd prefer to double check to avoid making false assumptions. I wasn't able to find any documentation on that particular point so if someone can shade some light on how things work under the hood that would be appreciated. Thanks!

App & System Services iCloud & Data CloudKit Core Data

918

Jun ’22

Detect/Receive CloudKit CoreData Errors

In development I've switched to NSPersistentCloudKitContainer and have begun the terrifying process of trying to test as many scenarios as possible to make sure nobody loses any data. During some testing I saw an error like this: I was able to fix this, but it was only affecting some scenarios and if this had happened to a real user they (and I) would never have known about the problem, and their data would not have synced to CloudKit. If the store fails to load you get an error, but if it loads but doesn't sync you don't. So my question is: is there a way to receive these kind of errors in code? I have looked for notifications and delegate methods and I can't find any.

App & System Services iCloud & Data CloudKit Core Data

1.2k

Jul ’20

Reply to Core Data Migration Strategy: store relocation, schema changes and CloudKit adoption in a single release?

Given that you'd move the Core Data store to a group container, I'd assume that the store will be shared across different processes, such as your main app and its extension (a widget, for example). In that case, I'd like to start with pointing you the following threads: Core Data Light Migration Crash When Widget is Installed (Error 134100). CoreData error=134100 Failed to open the store. These threads made it clear that: After a user installed your new version app, depending on what extension you have, the app and extension can open and migrate the store simultaneously, and so you will need to implement a mechanism to make sure that the store is only migrated once. Consider having your main app in charge of the the synchronization, as discussed in Avoid synchronizing a store with multiple persistent containers. Now to your questions: Store relocation vs schema migration Is it advisable to perform store relocation and schema migration in a single step, or should these be separate releases? If combined, are th

App & System Services iCloud & Data

Core Data + CloudKit crash on startup only in production

Hi, My macOS app's production build is crashing on start with an unhelpful crashdump. In the console, the only error in the Console is BUG IN CLIENT OF CLOUDKIT: Not entitled to listen to push notifications. Please add the 'com.apple.private.aps-connection-initiate' entitlement. Adding this entitlement to my entitlements.plist breaks the app entirely (Unsatisfied entitlements). Here is how I'm loading my persisten store: lazy var persistentContainer: NSPersistentCloudKitContainer = { let container = NSPersistentCloudKitContainer(name: ChatModel) guard let description = container.persistentStoreDescriptions.first else { fatalError(###(#function): Failed to retrieve a persistent store description.) } if(UserDefaults.standard.bool(forKey: StoredPreferenceKey.iCloudSync)){ description.cloudKitContainerOptions = NSPersistentCloudKitContainerOptions(containerIdentifier: iCloud.XXXXX) } else { description.cloudKitContainerOptions = nil } description.setOption(true as NSNumber, forKey: NSPersistentH

Developer Tools & Services Xcode APNS Xcode CloudKit Core Data

975

May ’23

WidgetKit + CoreData with CloudKit

Hi, I am developing an app with CoreData + CloudKit and wanted my Widget to fetch data from CloudKit to display. Everything is working on iOS / watchOS, but on WidgetKit the result from my fetch is always empty. I already configured the CloudKit capability on the Widget extension, then I am creating a new NSPersistentCloudKitContainer the and on public func timeline(with context: Context, completion: @escaping (Timeline<Entry>) -> ()) { I am trying to let cardsFetch = NSFetchRequest<Card>(entityName: Card) do { let cards = try persistentContainer.viewContext.fetch(cardsFetch) the result is always 0 and the same fetch on iOS returns the data. Is this supposed to work?

App & System Services iCloud & Data CloudKit WidgetKit

3.3k

Jul ’20

CloudKit - initializeCloudKitSchema error

Hi, I've previously used a local core data database successfully with my app and now I wanted to use NSPersistentCloudKitContainer to store the data in CloudKit. However when I do container.initializeCloudKitSchema(options: []) I receive an error which I'm not able to comprehend: CoreData: error: CoreData+CloudKit: -[NSCloudKitMirroringDelegate _requestAbortedNotInitialized:](2112): - Never successfully initialized and cannot execute request ' 17E8940B-00D6-4D01-AA78-6A04EBEBC957' due to error: ... 9 Batch Request Failed CKError's omited ... }> I also get this error in the console: Atomic failure = I've tried to reset Reset Environment in the CloudKit dashboard to no avail.

App & System Services iCloud & Data CloudKit Core Data

1.1k

Apr ’23