CloudKit Sharing

Question

I am having trouble understanding some of the CloudKit sharing concepts and the WWDC 2016 \"What\'s new in CloudKit\" video doesn\'t appear to explain everything that is req

Answer 1

I didn't understand quite well when you want to get those informations. I'm with the same problem as you, but I only can get the shared data by clicking the URL... To do that you'll need two functions. First one in AppDelegate:

func application(_ application: UIApplication, userDidAcceptCloudKitShareWith cloudKitShareMetadata: CKShareMetadata) {

    let acceptSharesOperation = CKAcceptSharesOperation(shareMetadatas: [cloudKitShareMetadata])
    acceptSharesOperation.perShareCompletionBlock = {
        metadata, share, error in
        if error != nil {
            print(error?.localizedDescription)
        } else {
            let viewController: ViewController = self.window?.rootViewController as! ViewController
            viewController.fetchShare(cloudKitShareMetadata)
        }
    }
    CKContainer(identifier: cloudKitShareMetadata.containerIdentifier).add(acceptSharesOperation)
}

in ViewConroller you have the function that will fetch this MetaData:

func fetchShare(_ metadata: CKShareMetadata) {
    let operation = CKFetchRecordsOperation(recordIDs: [metadata.rootRecordID])
    operation.perRecordCompletionBlock = { record, _, error in
        if error != nil {
            print(error?.localizedDescription)
        }
        if record != nil {
            DispatchQueue.main.async() {
                self.currentRecord = record
                //now you have your Shared Record
            }
        }
    }
    operation.fetchRecordsCompletionBlock = { _, error in
        if error != nil {
            print(error?.localizedDescription)
        }
    }
    CKContainer.default().sharedCloudDatabase.add(operation)
}

As I said before, I'm now trying to fetch the ShareDB without accessing the URL. I don't want to depend on the link once I already accepted the share. Hope this helps you!

Answer 2

Dude, I got it: First you need to get the CKRecordZone of that Shared Record. You do it by doing the following:

let sharedData = CKContainer.default().sharedCloudDatabase
    sharedData.fetchAllRecordZones { (recordZone, error) in
        if error != nil {
            print(error?.localizedDescription)
        }
        if let recordZones = recordZone {
            // Here you'll have an array of CKRecordZone that is in your SharedDB!
        }
    }

Now, with that array in hand, all you have to do is fetch normally:

func showData(id: CKRecordZoneID) {

    ctUsers = [CKRecord]()

    let sharedData = CKContainer.default().sharedCloudDatabase
    let predicate = NSPredicate(format: "TRUEPREDICATE")
    let query = CKQuery(recordType: "Elder", predicate: predicate)

    sharedData.perform(query, inZoneWith: id) { results, error in
        if let error = error {
            DispatchQueue.main.async {
                print("Cloud Query Error - Fetch Establishments: \(error)")
            }
            return
        }
        if let users = results {
            print(results)
            self.ctUsers = users
            print("\nHow many shares in cloud: \(self.ctUsers.count)\n")
            if self.ctUsers.count != 0 {
                // Here you'll your Shared CKRecords!
            }
            else {
                print("No shares in SharedDB\n")
            }
        }
    }
}