Refresh control!

Refreshcontrol.swift

/* Taken from stackOverflow http://stackoverflow.com/questions/24475792/how-to-use-pull-to-refresh-in-swift */
        self.refreshControl = UIRefreshControl()
        self.refreshControl?.attributedTitle = NSAttributedString(string: "Pull to refresh")
        self.refreshControl?.addTarget(self, action: "refreshTweets:", forControlEvents: UIControlEvents.ValueChanged)
        self.tableView.addSubview(self.refreshControl!)
        
        
    func refreshTweets (sender: AnyObject) {
        NetworkController.controller.fetchTimeLine(timelineType, isRefresh: true, newestTweet: self.tweets?[0], userScreenname: userTimelineShown) { (errorDescription, tweets) -> Void in
            if errorDescription != nil {
                //alert the user that something went wrong
                self.refreshControl?.endRefreshing()
            } else {
                println(self.tweets?.count)
                var tweetsInterim : [Tweet]? = tweets
                tweetsInterim! += self.tweets!
                self.tweets = tweetsInterim!
                println(self.tweets?.count)
                self.tableView.reloadData()
                self.refreshControl?.endRefreshing()
            }
        }
    }