ios - 从 CloudKit 保存 CompletionHandler 返回 Bool 不正确

Question

我正在创建一个应用程序，它将记录保存到 CloudKit 并将数据本地存储在 Core Data 中。我确实可以在两个位置保存记录，但是当 iCloud 连接不可用或存在保存错误时，我需要能够处理错误。我以为我可以在 CKModifyRecordsOperation 完成 block 中填充一个变量来区分，但这不起作用 - CloudKit 保存的返回值始终为 false，即使该过程成功。这个想法是首先保存到 CloudKit，然后检索 recordID 并将其与 Core Data 一起保存。

这是我的代码，我从栏按钮调用doTheComboSave()。控制台输出位于代码下方。任何意见，将不胜感激。 Xcode 8.3.3、Swift 3、iOS 10。

func saveNewCloudKitRecord() -> Bool {

    privateDatabase = container().privateCloudDatabase
    recordZone = CKRecordZone(zoneName: "myPatientZone")

    var blockSavedToCloudKit = false

    let myRecord = CKRecord(recordType: "Patient", zoneID: (recordZone?.zoneID)!)
    myRecord.setObject(firstNameTextField.text as CKRecordValue?, forKey: "firstname")
    myRecord.setObject(lastNameTextField.text as CKRecordValue?, forKey: "lastname")
    let parentRefID = CKRecordID(recordName: "047EBE6C-AB1C-0183-8D80-33C0E4AE228B", zoneID: (recordZone?.zoneID)!)
            //
    //bunch more record fields
    //

    let modifyRecordsOperation = CKModifyRecordsOperation(recordsToSave: [myRecord], recordIDsToDelete: nil)
    modifyRecordsOperation.timeoutIntervalForRequest = 10
    modifyRecordsOperation.timeoutIntervalForResource = 10

    modifyRecordsOperation.modifyRecordsCompletionBlock = {

        records, recordIDs, error in

        if let err = error {
            blockSavedToCloudKit = false
            //create placeholder record name for later updating
        } else {
            blockSavedToCloudKit = true
            self.currentRecord = myRecord
            self.passedInCKRecord = myRecord
        }//if err

    }//modifyRecordsOperation

    privateDatabase?.add(modifyRecordsOperation)

    print("blockSavedToCloudKit is \(blockSavedToCloudKit)")
    return blockSavedToCloudKit

}//saveNewCloudKitRecord


typealias SavedCompletion = (_ success:Bool) -> Void

func saveTwoFiles(completionHandler : SavedCompletion) {

    let flag = saveNewCloudKitRecord()
    print("flag is \(flag)")

    completionHandler(flag)
    print("completionHandler(flag) is \(flag)")
}//makeTheComboSave

func doTheComboSave() {

    saveTwoFiles() { (success) -> Void in

        print("saveTwoFiles is \(success)")

        if success {
            //will pass the CKRecord so core data can store the recordID and recordName
            saveTheNewRecord()//this is the Core Data save

            DispatchQueue.main.async {
                self.performSegue(withIdentifier: "unwindToMasterViewController", sender: self)
                print("Completion block has been run successfully.")
            }//Dispatch

        } else {
            //create placeholder recordName for later updating
            saveTheNewRecord()//this is the Core Data save
            DispatchQueue.main.async {
                self.performSegue(withIdentifier: "unwindToMasterViewController", sender: self)
                print("Completion block has been run but the file save to CloudKit failed.")
            }//Dispatch


        }//if else
    }//block

}//doTheComboSave

控制台输出:

blockSavedToCloudKit is false

flag is false

saveTwoFiles is false

completionHandler(flag) is false

Completion block has been run but the file save to CloudKit failed.

success in modifyRecordsOperation

currentRecordName is: B53DCFB8-0EFB-4E79-8762-FECCEFBA9BD8

Answer 1

请参阅上面 Ichydon 的评论。

saveNewCloudKitRecord() 函数在completionHandler 设置我想要使用的 bool 值之前返回。整个想法是首先创建 CloudKit 记录，以便我可以检索要存储在 Core Data 中的 recordName，以便同步本地和云记录。

更好的方法是首先保存到 Core Data，但自己创建 CKRecordID，并在保存到 CloudKit 时将其提供给记录。

在保存Core Data记录的函数中:

let myRecordName = UUID().uuidString

然后返回该字符串以用作 CloudKit 保存的参数。

let myRecordID : CKRecordID = CKRecordID(recordName: myRecordName, zoneID: (recordZone?.zoneID)!)

let myRecord = CKRecord(recordType: "Whatever", recordID : myRecordID)

希望这对其他人有帮助。