I'm using Parse.com on Swift, but TableView update doesn't work.

override func viewDidLoad(){
    super.viewDidLoad()

    Retrieving data from //parse
    self.loadData()
    // Configure DataSource settings.
    tableView.dataSource=self

    // Configure Delete.
    tableView.delegate=self

    // Pull to update
    self.pullrefresh()

}

Retrieving data from //parse
funcloadData(){
    varquery —PFQuery=PFQuery (className: "Comment")
    query.orderByDescending("createdAt")
    query.findObjectsInBackgroundWithBlock{(objects:[AnyObject]!, error:NSError!) ->Void in
        if(error!=nil){
            // error handling
        }

        // Put parse data in PFObject comments
        for object in objects {
            self.comments.addObject(object)
        }
       self.tableView.reloadData()
    }

}

// Pull to update function
func pullrefresh(){
    self.refreshControl=UIRefreshControl()
    self.refreshControl.attributedTitle=NSAttributedString(string: "↓pull")
    self.refreshControl.addTarget(self, action: "refresh:", forControlEvents:UICControlEvents.ValueChanged)
    self.tableView.addSubview(refreshControl)
}
// How to get data for updates
func refresh (sender: AnyObject)
{
    self.loadData()
    Finish //refresh
    self.refreshControl.endRefreshing()
}