Ios/swift/TableView/Pull更新

引っ張って更新する方法

   var refreshControl:UIRefreshControl!
   override func viewDidLoad() {
       super.viewDidLoad()
       self.refreshControl = UIRefreshControl()
       self.refreshControl.attributedTitle = NSAttributedString(string: "引っ張って更新")
       self.refreshControl.addTarget(self, action: #selector(ViewController.refresh), forControlEvents: UIControlEvents.ValueChanged)
       self.imgTableView.addSubview(refreshControl)
   }
   func refresh()
   {
       // ここに処理を記述
       // 更新オブジェクトを削除
       refreshControl.endRefreshing()
   }

参考：http://qiita.com/nagatasci/items/dbcc162a3a1fbfc181bf