数据更新时刷新tableview

Question

当reloadData()完成但网络没有停止时。

活动指标永远不会停止已在设备上更新的值

这是我的代码

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath, object: PFObject?) -> PFTableViewCell? {
    let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! drinkTableViewCell

    tableView.allowsSelection = false

    cell.parseObject = object
    cell.titles.text = object?.objectForKey("title") as? String
    cell.praise.text = object?.objectForKey("praise") as? String
    cell.prise.text = object?.objectForKey("price") as? String
    if let pfObject = object{

        var amount:Int! = pfObject["amount"] as! Int

        if amount == nil{
            amount = 0
        }
        cell.count.text = String(amount)
        if amount <= 0 {
            cell.minus.hidden = true
        }else{
            cell.minus.hidden = false
        }
    }

    let imgFile = object?.objectForKey("img") as? PFFile
    cell.images.file = imgFile
    cell.images.loadInBackground()

    object?.fetchInBackgroundWithBlock({ (object, error) in
            self.tableView.reloadData()
        })       


    return cell
}

我试过这个

if object?.dataAvailable == true{
        object?.fetchInBackgroundWithBlock({ (object, error) in
            self.tableView.reloadData()
        })       
    }