How to use pull to refresh in Swift3.0

Swift3.0

var refreshControl: UIRefreshControl!

override func viewDidLoad() {
    super.viewDidLoad()

    refreshControl = UIRefreshControl()
    refreshControl.attributedTitle = NSAttributedString(string: "Pull to refresh")
    refreshControl.addTarget(self, action: #selector(self.refresh), for: UIControlEvents.valueChanged)
    tableView.addSubview(refreshControl) 
}

func refresh(sender:AnyObject) {
    //  your code to refresh tableView
}

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