How to wait until cloud kit data is being synced with core data in swift in iOS13

user_6054042 0
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I developed core data based app and implemented iCloud sync feature after it was introduced in iOS 13.

I enabled iCloud kit, used NSPersistentCloudKitContainer instead of NSPersistentContainer and added several lines of code to sync core data with iCloud.

Sync works fine. The problem is that when I uninstall app and reinstall app, it doesn't fetch iCloud data at first time. I have to restart app or open another screens to let Core Data to be synced with iCloud. Is there anyway I can check if core data is being synced with iCloud or wait until it finishes syncing?

Thanks.

icloud swift core-data ios
2 Answers

There is no API exposed to get the completion handler on sync of all CKRecord's to NSManagedObject's.

Also the update is working using a background silent notification so we can expect any change anytime. So its good to not having completion handler

What's next

You can create one attribute to check the sync time, just like a date when last sync happened to local record and check the lastModificationDate (By default CKRecord has this property) of the same record in iCloud.

So everytime when you launch the app check for all the records manually if any update is required, then wait for notification of update and keep on checking the sync status

Note: Be careful this may lead to delay your launch process if from any other device user is very active and new records are getting inserted or modified.

user_52154740

Currently, there is no API provided for iCloud sync completion. What you can do is

user_52745700
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