'CoreData not updated until application inactivates

I'm building a Macos CoreData+CloudKit app.

I first create my container by doing this:

let container = NSPersistentCloudKitContainer(name: "TestApp")
let description = container.persistentStoreDescriptions.first
description?.setOption(true as NSNumber,
                       forKey: NSPersistentHistoryTrackingKey)
let remoteChangeKey = "NSPersistentStoreRemoteChangeNotificationOptionKey"
description?.setOption(true as NSNumber,
                           forKey: remoteChangeKey)
container.loadPersistentStores(completionHandler: { (storeDescription, error) in
    if let error = error {
        fatalError("Unresolved error \(error)")
    }
})

I'm registering to receive remote changes by doing this:

NotificationCenter.default.addObserver(
            self,
            selector: #selector(fetchChanges),
            name: NSNotification.Name(
                rawValue: "NSPersistentStoreRemoteChangeNotification"),
            object: persistentContainer.persistentStoreCoordinator
        )

And in fetchChanges, I just reload my UI by

  1. Fetching the data
  2. Reloading my tableView

However, I found out that fetchChanges is never called until the application inactivates. I see this in the log as:

CoreData: debug: CoreData+CloudKit: -[PFCloudKitThrottledNotificationObserver noteRecievedNotification:](40): <PFCloudKitThrottledNotificationObserver: 0x600003fb3fc0>: Got: NSApplicationWillBecomeActiveNotification - 0

What I'm assuming is happening is when CoreData detects my window inactivates via the NSApplicationWillBecomeActiveNotification event, it spawns a background task to fetch the remote iCloud data into the local store.

At that point, the NSPersistantStoreRemoteChangeNotification is received.

My question is how do you force the local store to sync with iCloud?

Any help is greatly appreciated.

swiftmacoscore-datacloudkit


Solution 1:[1]

Some possible clues:

  1. You need to activate "Background fetch" in the "Background Modes" of the target's Signing & Capabilities
  2. This happened to me because I needed to sign in to iCloud again (I had a prompt in the Settings, but if you don't it's worth trying to sign out and sign back in)

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Arnaud

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