Some users of my app are reporting total loss of data while using the app.
This is happening specifically when they enable iCloud sync.
I am doing following
private func setupContainer(enableICloud: Bool) {
container = NSPersistentCloudKitContainer(name: "")
container.viewContext.automaticallyMergesChangesFromParent = true
container.viewContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
guard let description: NSPersistentStoreDescription = container.persistentStoreDescriptions.first else {
fatalError()
}
description.setOption(true as NSNumber, forKey: NSPersistentHistoryTrackingKey)
description.setOption(true as NSNumber, forKey: NSPersistentStoreRemoteChangeNotificationPostOptionKey)
if enableICloud == false {
description.cloudKitContainerOptions = nil
}
container.loadPersistentStores { description, error in
if let error {
// Handle error
}
}
}
When user clicks on Toggle to enable/disable iCloud sync I just set the description.cloudKitContainerOptions to nil and then user is asked to restart the app.
Apart from that I periodically run the clear history
func deleteTransactionHistory() {
let sevenDaysAgo = Calendar.current.date(byAdding: .day, value: -7, to: Date())!
let purgeHistoryRequest = NSPersistentHistoryChangeRequest.deleteHistory(before: sevenDaysAgo)
let backgroundContext = container.newBackgroundContext()
backgroundContext.performAndWait {
try! backgroundContext.execute(purgeHistoryRequest)
}
}
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