Question

此应用使用CloudKit，我在本地将数据同步到Core Data。我相信我的基础工作有一个例外。以下代码检查CloudKit中的更改并允许我保存到Core Data但我无法将下载的更改限制为单个recordType（我有两个recordTypes，＆＃34; Patient＆＃34;＆＃34; PatientList＆＃34）。我认为CKFetchRecordZoneChangesOptions（）应该允许按recordType进行过滤，但我读过和尝试的所有内容只允许在所有recordTypes中通过desiredKeys进行过滤，这当然对我的目的没有用。我可以通过recordType限制核心数据保存，但这似乎是错误的方法。

任何指导都将不胜感激。 Xcode 8.3.3 iOS10 Swift 3

func checkUpdates() {

    let operation = CKFetchDatabaseChangesOperation(previousServerChangeToken: changeToken)
    let myZone : CKRecordZone = CKRecordZone(zoneName: "myPatientZone")

    var zonesIDs : [CKRecordZoneID] = []

    //you ONLY want changes from myPatientZone
    //you ONLY allow one custom zone and you ONLY share myPatientZone
    operation.recordZoneWithIDChangedBlock = { (zoneID) in
        if zoneID == myZone.zoneID {
            zonesIDs.append(zoneID)
        }//if
    }//recordZoneWithIDChangedBlock

    operation.changeTokenUpdatedBlock = { (token) in
        self.changeToken = token
    }

    operation.fetchDatabaseChangesCompletionBlock = { (token, more, error) in
        if error == nil && !zonesIDs.isEmpty {
            self.changeToken = token
            let options = CKFetchRecordZoneChangesOptions()
            options.previousServerChangeToken = self.fetchChangeToken
            let fetchOperation = CKFetchRecordZoneChangesOperation(recordZoneIDs: zonesIDs, optionsByRecordZoneID: [zonesIDs[0] : options])
            fetchOperation.recordChangedBlock = { (record) in

                let recordName = record.recordID.recordName

                let request : NSFetchRequest<Patient> = Patient.fetchRequest()
                request.predicate = NSPredicate(format: "recordName = %@", recordName)

                do {
                    let result = try self.persistentContainer.viewContext.fetch(request)

                    //if the record is not in the local core data
                    if result.isEmpty {
                        let patient = Patient(context: self.persistentContainer.viewContext)
                        patient.recordName = recordName
                        patient.firstName = record.object(forKey: "firstname") as? String
                        //all the other fields here...

                        try self.persistentContainer.viewContext.save()

                    } else {

                        //if the record is in core data but has been updated
                        let patient = result[0]

                        //patient.recordName - don't change

                        patient.firstName = record.object(forKey: "firstname") as? 
                        //all the other fields

                    }//if result.isEmpty

                } catch {
                    //add the CRS custom error handler
                    print("Error")
                }//do catch
            }//fetchOperation

            //fetchOperation.recordWithIDWasDeletedBlock = { (recordID, recordType) in

            //fetchOperation.recordZoneChangeTokensUpdatedBlock = { (zoneID, token, data) in


    database.add(operation)

}//checkUpdates

无法仅获取一个CloudKit RecordType

0 个答案: