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Hello, does anybody know how Apple anonymizes and aggregates the analytics provided to us devs? I'm interested in understanding the extent of their privacy safeguards. Do they employ federated analytics, or do they use a less effective method?

Hello. I recently released a new version (2.6) of my CloudKit syncing CoreData based app. The new version uses v18 of my data model. V18 is exactly like v17, except for a new optional string field in one of the entities. I diffed the two model versions to be extra sure. During my test I did not encounter any crash, and I also tested automatic migration, installing 2.55 and building 2.6 on top of it. No troubles. However my crash logger reports a number of crashes among my users. It's not a huge numbers (10 users over about 900 or more) but I am surprised it crashes at all. The crash happens when I call NSPersistentCloudKitContainer.loadPersistentStores, I get this error in the completion block: The model used to open the store is incompatible with the one used to create the store" I always assumed these slight changes (new field added to an existing model) did not require a manual migration. Any suggestions?

I use UserDefaults to store a variety of user data / preferences. Recently, I have started getting somewhat frequent complaints from users that their settings have been reset. There doesn't appear to be a rhyme or reason to the issue (some users have all of their data reset just once, while others are seeing that one of their settings resets very frequently). I haven't been able to pinpoint what the root cause is, but I figure that it must have something to do with UserDefaults (either all of it or only certain keys) somehow getting erased. As I figure out the root cause, I figure that a good solution in the meantime is to backup UserDefaults in some way (e.g. perhaps to iCloud?). Is there a standard / best-practice way of doing this?

Hello, we are planning to migrate an app that uses iCloud documents to store some documents that the user can upload/download and modify. In the official overview of App Transfer here, there are information related to CloudKit Containers and KVS but nothing related to iCloud Documents. The content of iCloud Documents is accessed using FileManager.default.url(forUbiquityContainerIdentifier: containerID) where the containerID has the form iCloud.com.things.things, even if in the official documentation it is written that the identifier must be prefixed with the Team ID. With this ID the storage works properly and we never experienced problems. Do you know if migrating an app with this functionality can be problematic? Do you know if the Team ID is somehow used even if not explicitly passed in the call to the function? Thank you and have a nice day!

I have an app that relies on CloudKit notifications for a core feature, but for about a week now the app is not receiving any CloudKit notifications. This follows a week in which I received "status 500" errors from CloudKit and my app was rendered useless. Those errors mysteriously stopped happening, but my app is still hindered by the lack of CloudKit notifications. I have not gotten any response from Apple on this, despite several attempts through various channels. It's not tenable to build apps that users rely on based on a platform that is so unreliable, and for which support is essentially nonexistent. To any CloudKit developers reading this: Please follow up with me so that I can resolve these issues for my users.

I recently discovered the new documentation for enabling CloudKit sync with SwiftData. A key step I was missing in my previous setup was this step: Initialize the CloudKit development schema. When I run this though, I get Core Data errors in my log... CoreData: Unsupported attribute type I've noticed that it seems to be preventing adding fields for my model properties that are Codable structs. I've been able to add Codable structs to my SwiftData models synced with CloudKit before. But using Core Data to initialize the CloudKit schema like the documentation suggests just doesn't work. Is there some other way around this? I'm about to just give up on CloudKit sync altogether. I need this to work because I'm trying to add some new fields and populate the fields with data based on existing data during the migration, but this seems to be preventing migration completely. If I don't initialize the schema, I get different errors and the ModelContainer won't initialize at all.

Sending push notifications does not work. The notification does not arrive, the loading hangs endlessly. Yesterday everything was fine with push notifications, but today they stopped coming. Has anyone come across what could be the problem?

Hey, I'm currently working on adding CloudKit support to the GRDB SQLite database in my app. CKSyncEngine, though still a bit tricky to wrap your head around, is amazing! I have most of the basic setup implemented and some very easy cases already work, which is really exciting! However, I do have some questions regarding data consistency across devices. I'm not sure though, that these questions are actually "correct" to ask. Maybe my entire approach is inherently flawed. Say we add two records to the pending changes of the sync engine: // I'm simplifying CKRecord.ID to be a String here syncEngine.state.add(pendingRecordZoneChanges: [.saveRecord("1"), .saveRecord("2")] Let's also say that both records are tightly connected. For example, they could be in a one-to-one relationship and must always be added to the database together because the app relies on the existence of either none or both. After that call, at some later point, the system will call the sync engine's delegate nextRecordZoneChangeBatch(_:syncEngine:) for us to batch the changes together to send to iCloud. First question: Can we guarantee that records "1" and "2" always land in the exact same batch, and are never separated? Looking at the example code, there are two line that worry me a bit: // (Sample project: `SyncedDatabase.swift, lines 132-133`) let scope = context.options.scope let changes = syncEngine.state.pendingRecordZoneChanges.filter { scope.contains($0) } The scope could lead to one of the two records being filtered out. However, my assumption is that the scope will always be .all when the system calls it from an automatically managed schedule, and only differs when you manually specify a different value through calling syncEngine.sendChanges(_:). Is that correct? Now back to the example. Say we successfully batched records "1" and "2" together and the changes have been sent to iCloud. Awesome! What happens next? Other connected devices will, at some point, fetch those changes and apply them to their respective local databases. Second question: Can we guarantee that iCloud sends the exact same batches from earlier to other devices and does not create new batches from all the changes? I'm worried that iCloud might take all stored changes and "re-batch" them for whatever reason (efficiency, for example). Because that could cause records "1" and "2" to be separated into different batches. A second device could end up receiving "1" and, for at least some period of time, will not receive "2", which would be an "illegal" state of the data. I'd appreciate any help or clarification on this :) Thanks a lot!

I currently have a production app that uses CloudKit I always struggle with testing the data within the development container and I was wondering if someone could share their current workflow. What is your current workflow when testing apps that use CloudKit, do you use your regular Apple User account for testing, or you use separate account? My concern is because I use my production app on a daily basis using my regular Apple user account, so I would like to keep the production iCloud data intact. In other words, I have my app on my phone with real data and now I need to test the app because there are some CloudKit syncing issues so I have the following questions. Can I connect my phone with production data to Xcode and use my regular Apple account for testing purposes? Will I be able to see the testing data in the CloudKit console? Will the production data merge with the testing data? I actually created a second Apple account thinking that I could use it for testing but logging off and logging back on to iCloud in your iPhone it's a pain, is this really what needs to be done? Any ideas would be greatly appreciated. Thanks

Questions about isExcludedFromBackup option and device migration I posted a similar question a year ago, but I still haven't found a solution that I like, so I'm leaving this question. If anyone knows how, please let me know. In our app, we set the isExcludedFromBackup option to true so that files currently in the Documents path are not backed up to iCloud. In the current situation, I am just curious as to whether the files of our app can be backed up in the two situations below. (with isExcludedFromBackup option set to true ) Migrate iPhone to new iPhone Backup and restore the entire device to iTunes If you set the isExcludedFromBackup option to true in the file, iCloud backup will not be possible, and the app's internal files will not be copied even in the two situations mentioned above. Is there an option or method in the app's internal code to prevent automatic backup only to iCloud and allow files to be copied or synchronized in the above two situations?

My app is currently on the app store for IOS, iPadOS and MacOS. I have created a version for Apple TV but cannot get it to save to iCloud. Is there anyone who can help me get my app to save to iCloud for the Apple TV?

Hello everyone, How do I need to handle the delete with the relationship deny? When I delete a model that still has a reference to another model, it deletes it from the UI. But when I re-run the simulator, it's back again. Does someone have a hint for me? How is it possible to ensure the uniqueness of the entries? Because I saw that the Attribute unique can't be used with CloudKit.

I am trying to create a specialised photo sharing social network using CloudKit alone. The app will never need to be non iOS, so on the surface Cloudkit has seemed like a perfect backend. However, I've found at random but semi frequent times, the loading of CKAssets from records can be very slow. For example, at normal times, all of the assets can load in a second or less. However at other times, it can take from 5 to 15 seconds. This is on a public database using a fetch operation where I already have the record IDs. Here is my code that performs that: mainDatabase.fetch(withRecordIDs: recordIDS, desiredKeys: ["image"]) { results in var recordsToReturn: [CKRecord] = [] switch results { case .success(let success): for (_, result) in success { switch result { case .success(let record): // If the result is success, append the record to the successfulRecords array recordsToReturn.append(record) break case .failure(_): break } } completion(.success(recordsToReturn)) case .failure(let failure): completion(.failure(failure)) } } } Of note, I have also tried using a database operation at set the qualityOfService to userInitiated, which has had the same noticeable load times. I have also tested this on different devices, on different networks (both cellular & different WiFi connections) and found also the same noticeable load times at random occurrences. Therefore, what I am trying to find out: Is this an expected behaviour from using CloudKit? Is there a much better way to load CKAssets that would drastically help this load time issue? Is CloudKit even a viable option for this kind of app, or is it not designed for this type of app? What alternative approaches could be taken? (Eg. store assets in AWS...) Would truly appreciate any feedback & guidance on this issue.

Hello, I want to build an app that will allow the user to entry some health related records and be synced with the HealthKit. Any record that is in the HealthKit is stored locally on the device. I find it conceptually unsure if I should be storing the HealthKit records in the SwiftData to make the user records available across the iCloud synced devices. Should I read the HealthKit record, make a copy of it (including it's ID) on my app's data in SwiftData? How the syncing should be done the right way? thanks.

Hi Forum, I am wondering how I can filter the data retrieving from CloudKit with SwiftData and using the #Predicate macro? I always get this error message: Thread 1: Fatal error: Predicate does not support keypaths with multiple components Does someone know how to add two predicates and use CloudKit? Thanks in advance 😊