Swift TableViewの再描画について

下記のソースコードを元にRSSリーダーを作成しています。

更新ボタンを設置し、ボタンを押下した際に再度パースを行い、TableViewを再描画したいのですが、どのように書けば良いでしょうか。
以下、簡易のソースコードになります。よろしくお願い致します。

class ListViewController: UIViewController, UITableViewDataSource, UITableViewDelegate, NSXMLParserDelegate {

    
    // outlet - table view
    @IBOutlet var myTableView: UITableView!
    
    // outet - activity indicator
    @IBOutlet var spinner: UIActivityIndicatorView!
    

    // xml parser
    var myParser: NSXMLParser = NSXMLParser()
    
    // rss records
    var rssRecordList : [RssRecord] = [RssRecord]()
    var rssRecord : RssRecord?
    var isTagFound = [ "item": false , "title":false, "pubDate": false ,"link":false]
    
    
    
    
    // MARK - View functions
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        
        // set tableview delegate
        self.myTableView.dataSource = self
        self.myTableView.delegate = self        
    }

    override func viewDidAppear(animated: Bool) {
     
        // load Rss data and parse
        if self.rssRecordList.isEmpty {
            self.loadRSSData()
        }
    }
    
    
    
    // MARK: - Table view dataSource and Delegate
    
    
    // return cell
    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        
        // collect reusable cell
        let cell = tableView.dequeueReusableCellWithIdentifier("rssCell", forIndexPath: indexPath) 
        
        // find record for current cell
        let thisRecord : RssRecord  = self.rssRecordList[indexPath.row]
        
        // set value for main title and detail tect
        cell.textLabel?.text = thisRecord.title
        cell.detailTextLabel?.text = thisRecord.pubDate
        
        // return cell
        return cell
    }

    @IBAction func refreshButtonClicked(sender: UIBarButtonItem) {
        //更新ボタンを押したとき
     self.rssRecordList = [RssRecord]()
        self.loadRSSData()
        self.myTableView.reloadData()
    }

    
    // MARK: - NSXML Parse delegate function

    // start parsing document
    func parserDidStartDocument(parser: NSXMLParser) {
        // start parsing
    }
    
    // element start detected
    func parser(parser: NSXMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String]) {
        
        if elementName == "item" {
            self.isTagFound["item"] = true
            self.rssRecord = RssRecord()
            
        }else if elementName == "title" {
            self.isTagFound["title"] = true
            
        }else if elementName == "link" {
            self.isTagFound["link"] = true
            
        }else if elementName == "pubDate" {
            self.isTagFound["pubDate"] = true
        }
        
    }
    
    // characters received for some element
    
    func parser(parser: NSXMLParser, foundCharacters string: String) {

        if isTagFound["title"] == true {
            self.rssRecord?.title += string
            
        }else if isTagFound["link"] == true {
            self.rssRecord?.link += string
            
        }else if isTagFound["pubDate"] == true {
            self.rssRecord?.pubDate += string            
        }
        
    }    
    
    // element end detected
    func parser(parser: NSXMLParser, didEndElement elementName: String, namespaceURI: String?, qualifiedName qName: String?) {
        
        if elementName == "item" {
            self.isTagFound["item"] = false
            self.rssRecordList.append(self.rssRecord!)
            
        }else if elementName == "title" {
            self.isTagFound["title"] = false
            
        }else if elementName == "link" {
            self.isTagFound["link"] = false
            
        }else if elementName == "pubDate" {
            self.isTagFound["pubDate"] = false
        }
    }
    
    // end parsing document
    func parserDidEndDocument(parser: NSXMLParser) {
        
        //reload table view
        self.myTableView.reloadData()
        
        // stop spinner
        self.spinner.stopAnimating()
    }
    
    // if any error detected while parsing.
    func parser(parser: NSXMLParser, parseErrorOccurred parseError: NSError) {
        
        //  stop animation
        self.spinner.stopAnimating()
        
    }
    
    // MARK: - Utility functions
    
    // load rss and parse it
    private func loadRSSData(){
        
        if let rssURL = NSURL(string: RSS_FEED_URL) {
            
            // start spinner
            self.spinner.startAnimating()
            
            // fetch rss content from url
            self.myParser = NSXMLParser(contentsOfURL: rssURL)!

            // set parser delegate
            self.myParser.delegate = self
            self.myParser.shouldResolveExternalEntities = false

            // start parsing
            self.myParser.parse()
        }
        
    }