SwiftData + CloudKit -- data not loaded on fresh install

Okay, so I created a new Xcode project using SwiftData, and ticked the box for iCloud integration. I added a container on the web dashboard. Then I added “ = Date()” to the definition of Item.timestamp so that it has a default value. I added the container to my Xcode project..

Then I added this “let config” and “let container” and changed the “.modelContainer” like this:

This will successfully add stuff to core data, which also appears in iCloud dashboard.

BUT, if I delete the app and re-launch, I don’t see the existing iCloud data until the SECOND launch, even though the Xcode runtime log shows it fetched it.

Do I need to do some magic to get it to refresh? Is the CloudKit subscription managed by SwiftData or do I need to do something for that?

thanks!

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Posted by
drewster
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  • Per suggestion in Slack's "data-frameworks" WWDC 2023 channel, I submitted Feedback, as FB12245665.

    —
    drewster

  • @drewster Have you tried using SwiftData locally, i.e., no CloudKit container? When I do that, I lose all data between launches as the underlying -wal gets replaced when the ModelContainer is created.

    —
    SGB

  • I don’t recall the exact differences offhand, but if you create a new project using SwiftData and without CloudKit, the setup is slightly different. I didn’t have any trouble with data persistence between runs.

    —
    drewster
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Without the "= Date()" I get an error. Why is that?

Posted by
sheldor222
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  • When using CloudKit, all fields in your model either need to have a default value or be optional.

    —
    drewster
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I was wondering if anybody has a solution? I just got my local data to sync with iCloud, that was fun and easy. At first time startup I have to start and stop then restart it so see the data stored in iCloud, or add a record.

My data model is very simple

@Model
final class Person{
    var name: String = ""
    var age: Int = 0
    
    init( name: String, age: Int) {
        self.name = name
        self.age = age
    }
}
Posted by
Tomha
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Have the APIs changed in iOS 17 beta 7? ModelConfigurations now want a CKDatabase and not an identifier, but the docs have not been updated to show how to create one.

Posted by
mctavish
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I'm having this exact same issue. Did anyone here happen to work out a solution? My app will work perfectly after adding data but on a fresh install on another device the data is returned as empty. I tried listening for "NSPersistentStoreRemoteChange" events which do come in eventually and then re-fetching the data but not working yet. My gut tells me there has to be a better way. I looked into CKSyncEngine but I really thought it shouldn't be necessary with SwiftData persistence and the fact that my app works fine on the new device on the second launch.

Posted by
andrewhargreaves
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