Discussion on "How to migrate NSPersistentCloudKitContainer to App Groups"

Kris Slazinski · 2023-06-02T15:05:03.070Z

Recently I needed to add iOS Widgets to my app Wins. As I discovered, if you are using Core Data and want to share data between your iOS app and widgets, you need to use App Groups. At first, I tried to migrate my database following the solution by D...

You should reset context before destroy container to don't get crash.

Cannot attach stack overflow link but you can find core data error

"Core data crash when resetting the store: 'Object's persistent store is not reachable from this NSManagedObjectContext's coordinator'"

Thank you very much for this code, I tried with ChatGPT and a YouTube video to create App Groups but only with you I could do the migration. The only problem, which is still small, is that the following line gave me an error because the database was not found:

init(inMemory: Bool = false) { container = NSPersistentCloudKitContainer(name: "iCloud.com.yourDomain.YourAppName’")

It should be only with the model name, ie: NSPersistentCloudKitContainer(name: "YourAppName’")

Rodrigo

Hi, Rodrigo. Thank you very much for your comment. I am glad to know that my article helped you 😊 As for the NSPersistentCloudKitContainer name... Did you maybe call your container using the "YourAppName" pattern? If so, yes, you need to use the same name in code. I have the following note in my article that explains more about the name of the container. Please let me know if it's still not clear and needs changes.

"We set our container as an NSPersistentCloudKitContainer with a name similar to "iCloud.com.yourDomain.YourAppName". One note here: while Apple suggests this naming convention, you can as well use a different one, for example, "iCloud.YourAppName". The most important thing is that this name must match the name of the iCloud container selected in the Signing & Capabilities tab of your app's target."

Thanks a lot for taking the time to share this knowledge, Kris.

You’re welcome ☺️ I am happy that you found it useful.

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How to migrate NSPersistentCloudKitContainer to App Groups

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