我用present(),为什么弹出的tableview的大小不是CGSize的大小？

Question

import UIKitclass XuanListController: UITableViewController {    var menusArr:Array<(String,String?)> = [("saoyisao", "扫一扫"), ( "SignRule",  "标记")]        override func viewDidLoad() {        super.viewDidLoad()        clearsSelectionOnViewWillAppear = false        preferredContentSize = CGSize(width: 320, height: 44)         tableView.register(UITableViewCell.self, forCellReuseIdentifier: "cell)    }       override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }    // MARK: - Table view data source    override func numberOfSections(in tableView: UITableView) -> Int {        // #warning Incomplete implementation, return the number of sections        return 1    }    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {        // #warning Incomplete implementation, return the number of rows        return menusArr.count    }        override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)        let (languageNames, languageCode) = menusArr[indexPath.row]        cell.textLabel?.text = languageCode        cell.imageView?.image = UIImage(named: languageNames)        // Configure the cell...        return cell    }}