SwiftData + CloudKit -- data not loaded on fresh install

Question

Created Jun ’23

Replies 7

Boosts 3

Views 3.7k

Participants 6

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..

Screenshot 2023-06-06 at 12.30.16 PM.png

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

Screenshot 2023-06-06 at 12.29.30 PM.png

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!

Boost

Answer 1

drewster OP

Jun ’23

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

0

Answer 2

SGB OP

Jun ’23

@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.

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Answer 3

sheldor222 OP

Jun ’23

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

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Answer 4

drewster OP

Jun ’23

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.

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Answer 5

Tomha OP

Jun ’23

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
    }
}

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Answer 6

mctavish OP

Aug ’23

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.

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Answer 7

andrewhargreaves OP

Jan ’24

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.

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