NSPersistentCloudKitContainer

Hi, This post helped me so I figured I'd post a working example of the core data model that I am successfully using in a new Swift Package. This code below is from the lazy var persistentContainer: let bundle = Bundle.module let modelURL = bundle.url(forResource: ModelName, withExtension: .momd)! let model = NSManagedObjectModel(contentsOf: modelURL)! let container = NSPersistentCloudKitContainer(name: ModelName, managedObjectModel: model) You can make the model a lazy var. I call it from the host app below: NavigationLink(destination: GenericListCDView() .environment(.managedObjectContext,ModelCDStack.shared.context) , label: { Text(My List) }) Hope this helps.

I've tried to implement some code for sharing manually with working CloudKit + CoreData mirroring. I've stuck on the parent records (I have one-to-many relationship and child records need to be shared when parent record is shared) and here is why. I've implemented code that is setting parent records for each NSManagedObject's CKRecord, syncing works well, but it causes huge troubles like: I call my setParentRecords among other places from NWPathMonitor's pathUpdateHandler (literally when internet restored), and fetching NSManagedObjects that's CKRecords if any don't have parent on the server yet. Apple's NSCloudKitMirroringDelegate is doing the same also on internet restore. And my any fetching at this second causes crash of Mirroring. Mirroring do not work since this point and says probably no internet each time! I could not beat that problem and I am afraid that will have to implement whole sync by myself, even for privateDatabase just because of such bugs (and no any completion handlers in NSPersistentCloudKitContainer

I'll make a guess you are implementing your App struct as if it were a class and accidentally creating a new instance of NSPersistentCloudKitContainer every time SwiftUI recreates the struct. You could access the persistent container lazy property through a @UIApplicationDelegateDelegateAdaptor so it is only created once. import SwiftUI import CoreData @main struct MasterDetailApp: App { t@UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate tt ttvar body: some Scene { ttttWindowGroup { ttttttContentView().environment(.managedObjectContext, appDelegate.persistentContainer.viewContext) tttt} tt} }

I wanted to give this thread a bump because I too am facing the same issue. The proposed answer from rr0924, and the referenced article from Antoine van der Lee, does not work for me either. To inject my CoreData model into the Widget extension one failing attempt I've tried was to use a similar method in my iOS app and watchOS companion app. For example this code will allow proper access to CoreData from iOS and watchOS; @main struct RunRosterApp: App { @Environment(.scenePhase) private var scenePhase @StateObject private var persistentStore = PersistentStore.shared var body: some Scene { WindowGroup { ContentView() .environment(.managedObjectContext, persistentStore.context) } } The PersistentStore class is a set up as a singleton to load the NSPersistentCloudKitContainer. That code is fairly boiler plate so I won't post it but can upon request. Using a similar pattern in WidgetKit and SwiftUI I currently have this; @main struct WidgetRunPlanner: Widget { @StateObject private var persistentStore =

NSPersistentCloudKitContainer never supported unique constraints. In iOS 14 we made this a lot more obvious.

https://developer.apple.com/documentation/coredata/nspersistentcloudkitcontainer/3343548-initializecloudkitschemawithopti?language=objc

No. NSPersistentCloudKitContainer does not use queries in the private database, only the public.

CKDatabaseScopeShared is not supported with NSPersistentCloudKitContainer?

I was able to remove the warnings by registering a new value transformer. I'm persisting a CLLocation, which conforms to NSSecureCoding. import Foundation import CoreLocation @objc(CLLocationValueTransformer) final class CLLocationValueTransformer: NSSecureUnarchiveFromDataTransformer { static let name = NSValueTransformerName(rawValue: String(describing: CLLocationValueTransformer.self)) override static var allowedTopLevelClasses: [AnyClass] { return [CLLocation.self] } public static func register() { let transformer = CLLocationValueTransformer() ValueTransformer.setValueTransformer(transformer, forName: name) } } Adding CLLocationValueTransformer as the transformer name works without warnings. The value is synced properly via NSPersistentCloudKitContainer, verified on multiple devices.

Thanks @nigelfromtewkesbury that worked for me, too. Also led me to persistence.swift:34 where you can change the name of the data model it looks for: container = NSPersistentCloudKitContainer(name: YourContainerName)

Hi cristosv, Thanks for posting your solution to this online. I'm having the same problem, but it would be great it for you could help a little more. For example, all your code is working fine, but I can't seem to figure out how to use my core data entity in a Text() view in my widget. Below is my code, and any help with this or more sample code would be great. Thanks 🙏 import WidgetKit import SwiftUI import Intents import CoreData struct Provider: IntentTimelineProvider { func placeholder(in context: Context) -> SimpleEntry { SimpleEntry(date: Date(), configuration: ConfigurationIntent()) } func getSnapshot(for configuration: ConfigurationIntent, in context: Context, completion: @escaping (SimpleEntry) -> ()) { let entry = SimpleEntry(date: Date(), configuration: configuration) completion(entry) } func getTimeline(for configuration: ConfigurationIntent, in context: Context, completion: @escaping (Timeline) -> ()) { var entries: [SimpleEntry] = [] // Generate a timeline consisting of five entries an