Question

我从CloudKit Server获取记录更改，但每次出现错误

[LogFacilityCK]操作E0367CA861DAF5A9出现连接错误：错误域= NSCocoaErrorDomain代码= 4097“连接到名为的服务 com.apple.cloudd“UserInfo = {NSDebugDescription =与服务的连接名为com.apple.cloudd}

我知道原因是因为我错误地初始化了CKFetchRecordZoneChangesOperation 请检查以下代码并纠正我：

 CKFetchRecordZoneChangesOperation  *operation = [[CKFetchRecordZoneChangesOperation alloc]initWithRecordZoneIDs:@[ recordZoneID ] optionsByRecordZoneID:@{@"Zone":recordZoneID,@"FetchRecordZoneChangesOptions":option}];

我需要这方面的帮助：

**@{@"Zone":recordZoneID,@"FetchRecordZoneChangesOptions":option}];**

Answer 1

只需创建变量：

var serverChangeToken: CKServerChangeToken? {

    guard let encoded = UserDefaults(suiteName: SharedGroupName)?.data(forKey: ServerChangeTokenKey) else {
        return nil
    }

    return NSKeyedUnarchiver.unarchiveObject(with: encoded) as? CKServerChangeToken
}

然后初始化一个对象：

        let zone = CKRecordZone(zoneName: "my_custom_zone_name")
        let options = CKFetchRecordZoneChangesOptions()
        options.previousServerChangeToken = serverChangeToken

        let operation = CKFetchRecordZoneChangesOperation(recordZoneIDs: [zone.zoneID], optionsByRecordZoneID: [zone.zoneID: options])

Answer 2

即使使用正确的CKServerChangeToken，我也遇到了这个错误，因为我没有控制数组changedZoneIDs有0个元素的情况。

严格地说，您需要两个单独的CKServerChangeToken来访问数据库更改和zoneChanges（比方说databaseChangeToken和zoneChangeToken）。您可以像BartłomiejSemańczyk所说的那样创建它们

- 使用recordZoneWithIDChangedBlock获取更改区域的zoneID -use fetchDatabaseChangesCompletionBlock保存databaseChangeToken并调用CKFetchRecordZoneChangesOperation，使用zoneChangeToken，
-each zone有自己的changeToken，所以我最终得到了这个解决方案：

let operation = CKFetchDatabaseChangesOperation(previousServerChangeToken: databaseChangeToken)
var changedZoneIDs: [CKRecordZoneID] = []

operation.recordZoneWithIDChangedBlock = { (zoneID) in
    changedZoneIDs.append(zoneID)
}

operation.fetchDatabaseChangesCompletionBlock = { (databaseToken, moreComing, error) in
{
    //manage moreComing
    //save databaseToken
    //manage error

    if changedZoneIDs.count > 0
    {
        var optionsByRecordZoneID = [CKRecordZoneID: CKFetchRecordZoneChangesOptions]()
        for zoneID in changedZoneIDs {
            let changeTokenData = UserDefaults.standard.value(forKey: "\(zoneID.zoneName) zoneChangeToken") as? Data // Read change token from disk
            var zoneChangeToken:CKServerChangeToken?

            if (changeTokenData != nil){
                zoneChangeToken = NSKeyedUnarchiver.unarchiveObject(with: changeTokenData!)as! CKServerChangeToken?
            }
            let options = CKFetchRecordZoneChangesOptions()
            options.previousServerChangeToken = zoneChangeToken
            optionsByRecordZoneID[zoneID] = options
        }
        let operation = CKFetchRecordZoneChangesOperation(recordZoneIDs: changedZoneIDs, optionsByRecordZoneID: optionsByRecordZoneID)

    // ...
    }

如何用previousServerchangetoken初始化CKFetchRecordZoneChangesOperation？

2 个答案: