需要在CloudKit查询后立即激活完成块

我一直在思考如何编写CloudKit完成块。我的问题是我正在加载数据,然后将数据放在tableView中。问题是我必须用一个按钮手动刷新tableView,而不是将数据自动加载到其中。我需要的是在查询结束时使用一个完成块来重新加载表数据。下面是我的查询功能:

func loadGroupPage() {
    print("should go")
    // let pred = NSPredicate(format: "Username = %@", usernameText)
    let pred = NSPredicate(format: "groupName = %@", "\(selectedCellName)")
    let query = CKQuery(recordType: "Group", predicate: pred)
    let operation = CKQueryOperation(query: query)
    //operation.resultsLimit = CKQueryOperationMaximumResults
    operation.recordFetchedBlock = { (record: CKRecord!) in
       operation.qualityOfService = .default

        if record != nil{

            // setup screen after loading data

            self.recordToUpdate = record

            if creatingNewPost == true{
                print(feed)
                //create new post record (modify record)
                feed.append(postText)
                creatingNewPost = false
                self.saveNewPost()
            }

            self.publicOrPrivate = (record.object(forKey: "PublicOrPrivate") as! String)
            if self.publicOrPrivate == "Public"{
                // public
                //print("you have joined")

            }else if self.publicOrPrivate == "Private"{
                // private
                //print("requestSent")
                // self.sendRequest()
                 self.requests = (record.object(forKey: "Requests") as! Array)
            }
            if self.groupMembs.contains(username) || members.contains(username){
                self.joinBtn.alpha = 0
                // in group
            }else{
                self.joinBtn.alpha = 1
            }
            if self.leaders.contains(username) && self.publicOrPrivate == "Private"{
                // leader
                self.requestsTableView.alpha = 1
            }else{
                self.requestsTableView.alpha = 0
            }
            if self.groupMembs.contains(username) || self.publicOrPrivate == "Public"{
                // leader

                feed = (record.object(forKey: "groupFeed") as! Array)
                print(feed)
            }else{

            }
            self.groupMembs = (record.object(forKey: "memberUsernames") as! Array)

            print(self.groupMembs)
            self.numberOfMembersInGroup = self.groupMembs.count
            self.groupNameLbl.text = selectedCellName
            self.numberOfMembersLbl.text = "\(self.numberOfMembersInGroup) Members"
            self.leaders = (record.object(forKey: "leaders") as! Array)

            //****************************************************
            // this does nothing until I refresh it manually!
            self.requestsTableView.reloadData()
            self.groupFeedTableView.reloadData()
            //****************************************************
            //Need completion block so the above two lines will fire directly after data is done loading!
        }

    }
    database.add(operation)    
}

正如我在上面的代码中所记录的那样,在那里刷新表不会在实际的UI中加载任何内容。有人能帮我写一个完成块来重新加载tableView吗?谢谢