Swift CloudKit SaveRecord“保存记录时出错”

我正在尝试将记录保存到 CloudKit，但收到错误。我在其他地方看到这是一个需要知道如何保存的问题，但我无法让它发挥作用。

    var database:CKDatabase = CKContainer.defaultContainer().publicCloudDatabase
    var aRecord:CKRecord!

    if self.cloudId == nil {
        var recordId:CKRecordID = CKRecordID(recordName: "RecordId")
        self.cloudId = recordId // Setup at top
    }

    aRecord = CKRecord(recordType: "RecordType", recordID: self.cloudId)
    aRecord.setObject(self.localId, forKey: "localId")

    // Set the normal names etc
    aRecord.setObject(self.name, forKey: "name")

    var ops:CKModifyRecordsOperation = CKModifyRecordsOperation()
    ops.savePolicy = CKRecordSavePolicy.IfServerRecordUnchanged

    database.addOperation(ops)
    database.saveRecord(aRecord, completionHandler: { (record, error) in

        if error != nil {
            println("There was an error \(error.description)!")

        } else {
            var theRecord:CKRecord = record as CKRecord
            self.cloudId = theRecord.recordID
        }
    })

这给了我错误：

There was an error <CKError 0x16d963e0: "Server Record Changed" (14/2017); "Error saving record <CKRecordID: 0x15651730; xxxxxx:(_defaultZone:__defaultOwner__)> to server: (null)"; uuid = 369226C6-3FAF-418D-A346-49071D3DD70A; container ID = "iCloud.com.xxxxx.xxxx-2">!

不确定，因为我已经添加了 CKModifyRecordsOperation。遗憾的是，Apple 的文档中没有任何示例。我很怀念那个（你可以在 MSDN 上找到）。

谢谢偷看！

可以使用 CKDatabase 的便捷方法将记录保存到 iCloudsaveRecord:或通过 CKModifyRecordsOperation。如果是单条记录，则可以使用saveRecord:但需要获取您想要修改的记录fetchRecordWithID:在将其保存回 iCloud 之前。否则，它只会让您使用新的 RecordID 保存记录。更多这里。 https://stackoverflow.com/questions/24509782/saving-modified-data-in-cloudkit/24520514#24520514

database.fetchRecordWithID(recordId, completionHandler: { record, error in
    if let fetchError = error {
            println("An error occurred in \(fetchError)")
        } else {
            // Modify the record
            record.setObject(newName, forKey: "name")
        } 
}


database.saveRecord(aRecord, completionHandler: { record, error in
    if let saveError = error {
            println("An error occurred in \(saveError)")
        } else {
            // Saved record
        } 
}

上面的代码只是方向正确，但不会按原样工作，因为当 fetchRecordWithID 的completionHandler 返回时，saveRecord 已经被触发。一个简单的解决方案是将 saveRecord 嵌套在 fetchRecordWithID 的completionHandler 中。一个可能更好的解决方案是将每个调用包装在NSBlockOperation并将它们添加到 NSOperationQueue 中，saveOperation 依赖于 fetchOperation。

这部分代码将用于CKModifyRecordsOperation如果您只更新一条记录，则不需要：

var ops:CKModifyRecordsOperation = CKModifyRecordsOperation()
ops.savePolicy = CKRecordSavePolicy.IfServerRecordUnchanged
database.addOperation(ops)

如果您确实使用CKModifyRecordsOperation相反，您还需要设置至少一个完成块，并在检测到与现有记录存在冲突时处理错误：

let saveRecordsOperation = CKModifyRecordsOperation()

var ckRecordsArray = [CKRecord]()
// set values to ckRecordsArray

saveRecordsOperation.recordsToSave = ckRecordsArray
saveRecordsOperation.savePolicy = .IfServerRecordUnchanged
saveRecordsOperation.perRecordCompletionBlock { record, error in
    // deal with conflicts
    // set completionHandler of wrapper operation if it's the case
}

saveRecordsOperation.modifyRecordsCompletionBlock { savedRecords, deletedRecordIDs, error in
    // deal with conflicts
    // set completionHandler of wrapper operation if it's the case
}

database.addOperation(saveRecordsOperation)

除了使用 Objective-C 语言编写的 CloudKitAtlas 演示应用程序之外，还没有太多示例代码。希望这可以帮助。