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CloudKit Sync using NSPersistentCloudKitContainer in iOS13


By : 常贺贺
Date : October 01 2020, 02:00 AM
help you fix your problem Frustratingly, I think this is 'normal' behaviour, particularly with a large database with a large number of relationships to sync - there is no way to see the progress (to show the user) nor can you speed it up.
NSPersistentCloudKitContainer seems to treat each relationship as an individual CKRecord, with syncing still bound by the same limitations (ie. no more than 400 'requests' at a time), you'll often see these .limitExceeded errors in the Console, but with little other information (ie. if/when will it retry??).
code :
static var useCloudSync = UserDefaults.standard.bool(forKey: "useCloudSync")
static var persistentContainer:  NSPersistentContainer  = {
    let container: NSPersistentContainer?
    if useCloudSync {
        container = NSPersistentCloudKitContainer(name: "MyApp")
    } else {
        container = NSPersistentContainer(name: "MyApp")
        let description = container!.persistentStoreDescriptions.first
        description?.setOption(true as NSNumber,
                               forKey: NSPersistentHistoryTrackingKey)

    }
    container!.loadPersistentStores(completionHandler: { (storeDescription, error) in
    if let error = error as NSError? {
        fatalError("Unresolved error \(error), \(error.userInfo)")
    }
    })
    return container!
}()


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CloudKit: Using notifications to keep changes in sync across multiple devices


By : Ivo
Date : March 29 2020, 07:55 AM
it should still fix some issue The server will delete the old notifications, regardless of the read status.

CloudKit sync testing with sandbox users


By : Chang Xu
Date : March 29 2020, 07:55 AM
wish helps you Question 1: Using the App Receipt to restore non-renewable subscriptions
From Apple's Documentation:
code :
Subscription type       Auto-renewable   Non-renewing    Free
Users can buy           Multiple times   Multiple times  Once
Appears in the receipt  Always           Always          Always
Synced across devices   By the system    By your app     By the system
Restored                By the system    By your app     By the system

CloudKit Offline Sync


By : Chris Johnson
Date : March 29 2020, 07:55 AM
Hope that helps In order to work with CloudKit you must be online. Being offline returns a CKError detailed and Internet Connecction error.
fetchAllLongLivedOperationIDs only returns the operations IDs that are running or had finished in a short period of time.

IOS13+ NSPersistentCloudKitContainer UIRefreshControl how to refresh UITableView content


By : user261130
Date : March 29 2020, 07:55 AM
hope this fix your issue Using NSFetchedResultsController will keep your table in sync with the CoreData database automatically. In the code below, you'll have to replace instances of YourEntityName with the real database entity name that you're using in your project.
You might also want to set request.sortDescriptors appropriately. For example, if you are using a search bar you could include the search bar text in the sort descriptors, and then you'd have to call the method updateFetchedResultsController() each time the search bar text changes.
code :
import UIKit
import CoreData

class YourTableViewController: UITableViewController, NSFetchedResultsControllerDelegate {

    var container: NSPersistentContainer? = (UIApplication.shared.delegate as? AppDelegate)?.persistentContainer

    var fetchedResultsController: NSFetchedResultsController<YourEntityName>? {
        didSet {
            fetchedResultsController?.delegate = self
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        updateFetchedResultsController()
    }

    func updateFetchedResultsController() {
        guard let context = container?.viewContext else {
            return
        }

        context.performAndWait {
            let request: NSFetchRequest<YourEntityName> = YourEntityName.fetchRequest()
            request.sortDescriptors = nil // set sort descriptors if you want data ordered specifically
            request.predicate = nil // set predicate if you only want specific data

            fetchedResultsController = NSFetchedResultsController<YourEntityName>(
                fetchRequest: request,
                managedObjectContext: context,
                sectionNameKeyPath: nil,
                cacheName: nil
            )

            do {
                try fetchedResultsController!.performFetch()
                tableView.reloadData()
            } catch {
                // Handle the error, for example, present an alert
            }
        }
    }

    // MARK:- UITableViewDataSource

    override func numberOfSections(in tableView: UITableView) -> Int {
        return fetchedResultsController?.sections?.count ?? 0
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        if let sections = fetchedResultsController?.sections, sections.count > 0 {
            return sections[section].numberOfObjects
        }
        return 0
    }

    override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        if let sections = fetchedResultsController?.sections, sections.count > 0 {
            return sections[section].name
        }
        return nil
    }

    override func sectionIndexTitles(for tableView: UITableView) -> [String]? {
        return fetchedResultsController?.sectionIndexTitles
    }

    override func tableView(_ tableView: UITableView, sectionForSectionIndexTitle title: String, at index: Int) -> Int {
        return fetchedResultsController?.section(forSectionIndexTitle: title, at: index) ?? 0
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "YourCellIdentifier", for: indexPath) as! YourTableViewCell        
        let object = fetchedResultsController?.object(at: indexPath)
        // use data in object to update your cell
        return cell
    }

    // MARK:- NSFetchedResultsControllerDelegate

    func controllerWillChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
        tableView.beginUpdates()
    }

    func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange sectionInfo: NSFetchedResultsSectionInfo, atSectionIndex sectionIndex: Int, for type: NSFetchedResultsChangeType) {
        switch type {
        case .insert: tableView.insertSections([sectionIndex], with: .fade)
        case .delete: tableView.deleteSections([sectionIndex], with: .fade)
        default: break
        }
    }

    func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any, at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) {
        switch type {
        case .insert:
            tableView.insertRows(at: [newIndexPath!], with: .fade)
        case .delete:
            tableView.deleteRows(at: [indexPath!], with: .fade)
        case .update:
            tableView.reloadRows(at: [indexPath!], with: .fade)
        case .move:
            tableView.deleteRows(at: [indexPath!], with: .fade)
            tableView.insertRows(at: [newIndexPath!], with: .fade)
        default:
            break
        }
    }

    func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
        tableView.endUpdates()
    }
lazy var persistentContainer: NSPersistentCloudKitContainer = {

    let container = NSPersistentCloudKitContainer(name: "YourEntityName")

    container.loadPersistentStores { description, error in
        if let error = error {
            // handle the error
        }
    }

    container.viewContext.automaticallyMergesChangesFromParent = true
    return container
}()

How to sync records between Core Data and CloudKit efficiently


By : Shwar Randive
Date : March 29 2020, 07:55 AM
hop of those help? Core Data already provides the user with the ability to sync to iCloud. There's no need to use CloudKit.
Design For Core Data In iCloud
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