ios - 如何使用 previousServerchangetoken 初始化 CKFetchRecordZoneChangesOperation？

Question

我正在从 CloudKit 服务器获取记录更改，但每次我都会出错

[LogFacilityCK] Got a connection error for operation E0367CA861DAF5A9: Error Domain=NSCocoaErrorDomain Code=4097 "connection to service named com.apple.cloudd" UserInfo={NSDebugDescription=connection to service named com.apple.cloudd}

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

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

我需要这部分的帮助:

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

Answer 1

简单地创建变量:

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])