PFQueryTableViewController不能与iOS 8自动调整单元格功能一起使用？

Question

我有一个带有表视图的UIViewController，它从Parse获取数据，并且它适用于自动调整大小。在阅读文档的过程中，我看到有一个名为PFQueryTableViewController的控制器，它具有分页，拉动刷新和其他很酷的功能。但是现在自动调整大小并不起作用，每个单元格都覆盖下一个。这是我的代码：

import UIKit

class WallParse: PFQueryTableViewController {


    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)

        self.parseClassName = "Post"
        self.pullToRefreshEnabled = true
        self.paginationEnabled = true
        self.objectsPerPage = 3

    }

    override func viewDidLoad() {
        super.viewDidLoad()
        self.tableView.estimatedRowHeight = 400
        self.tableView.rowHeight = UITableViewAutomaticDimension

    }

    override init!(style: UITableViewStyle, className: String!) {
        super.init(style: style, className: className)
    }

    override func queryForTable() -> PFQuery {

        var query = PFQuery (className: self.parseClassName)

        // If no objects are loaded in memory, we look to the cache first to fill the table
        // and then subsequently do a query against the network.

        if (self.objects.count == 0) {

            query.cachePolicy = kPFCachePolicyCacheThenNetwork;

        }

        query.orderByDescending("createdAt")


        return query
    }

    override func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!, object: PFObject!) -> PFTableViewCell! {

        let cellIdentifier = "cell"

        var cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier) as WallCell

        // Configure the cell to show todo item with a priority at the bottom
        cell.commentLabel.text = object["text"] as? String

        return cell;
    }


    override func tableView(tableView: UITableView, estimatedHeightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
        return UITableViewAutomaticDimension
    }
}