我有一个具有许多位置CKRecords的联系人CKRecord（一对多关系） 联系人CKRecord和位置CKRecord均在公共数据库中创建。我通过在位置上名为owneringContact的字段将来回CKReference添加到locaiotn。

ckRecord["owningContact"] = CKReference(record: contactRecord!,action: .deleteSelf)

我转到cloudKit仪表板并验证两个记录均存在。位置CKRecord具有字段owneringContact，该字段拥有联系人CKRecord的recordName。我定义了一个函数来获取这样的位置：

private func iCloudFetchLocations(withContactCKRecord: CKRecord,completionHandler: @escaping ([CKRecord]?,Error?) -> Void) {
     var records = [CKRecord]()

    let recordToMatch = CKReference(recordID: withContactCKRecord.recordID,action: .deleteSelf)
    let predicate = NSPredicate(format: "owningContact == %@",recordToMatch)
    
    // Create the query object.
    let query = CKQuery(recordType: "location",predicate: predicate)
    let queryOp = CKQueryOperation(query: query)
    queryOp.resultsLimit = 1
    queryOp.qualityOfService = .userInteractive
    queryOp.recordFetchedBlock = {
        records.append($0)
        print($0)
    }
    queryOp.queryCompletionBlock = { (cursor,error) in
        guard error == nil else {
            if let ckerror = error as? CKError {
                
                self.aErrorHandler.handleCkError(ckerror: ckerror)
            }
            return
        }
        if (cursor != nil) {
            let newOperation = CKQueryOperation(cursor: cursor!)
            newOperation.resultsLimit = queryOp.resultsLimit
            newOperation.recordFetchedBlock = queryOp.recordFetchedBlock
            newOperation.queryCompletionBlock = queryOp.queryCompletionBlock
        
            self.publicDB?.add(newOperation)
        }
        completionHandler(records,error)
    }
    self.publicDB?.add(queryOp)
}

然后我调用代码以基于联系人CKRecord来获取位置CKRecord，如下所示：

 let predicate = NSPredicate(format: "TRUEPREDICATE")
    let query = CKQuery(recordType: Cloud.Entity.Contact,predicate: predicate)
    publicDB?.perform(query,inZoneWith: nil,completionHandler: { (records,error) in
        guard error == nil else {
            if let ckerror = error as? CKError {
                self.aErrorHandler.handleCkError(ckerror: ckerror)
            }
            return
            completion(false)
        }
        if let contactRecords = records {
            for aContactRecord in contactRecords {
                // fetch Location Data
                self.iCloudFetchLocations(withContactCKRecord: aContactRecord,completionHandler: { records,error in
                    guard error == nil else {
                        if let ckerror = error as? CKError {
                            self.aErrorHandler.handleCkError(ckerror: ckerror)
                        }
                        return
                            completion(false)
                    }
                    
                    if let locationRecords = records {
              }
         })
     }
  }
 })

我有两个联系人，第一个已被CKReferenc'ed到该位置，而第二个联系人仍未被CKReferenc'ed到该位置。 我认为这是问题所在：第一次在循环联系中，通过调用iCloudFetchLocations发送CKRecord信息，该信息立即返回而无需等待云响应，并且for循环发送第二个联系并再次调用iCloudFetchLocations。由于第二个联系人没有该位置的CKReference，因此通话失败，而且我还无法到达第一个联系人的位置，因为它尚未返回。

该如何解决？