class ExampleViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
	
	// assuming we've added a UITableView as a subview
	//	to our UIViewController in Storyboard and connected it
	@IBOutlet var tableView: UITableView!

	override func viewDidLoad() {
		super.viewDidLoad()
		
		tableView.dataSource = self
		tableView.delegate = self
		
		// instantiate a UIRefreshControl
		let refreshControl = UIRefreshControl()
		// assign its target action
		refreshControl.addTarget(self, action: #selector(doRefresh(_:)), for: .valueChanged)
		// assign it to the tableView's .refreshControl property
		tableView.refreshControl = refreshControl
		
	}
	
	@objc func doRefresh(_ sender: Any?) -> Void {
		// do what we want for refreshing...
		//	here, we delay for 1-second to simulate getting new data
		DispatchQueue.main.asyncAfter(deadline: .now() + 1.0, execute: {
			// get a reference to the Refresh Control that called this func
			guard let rc = sender as? UIRefreshControl else { return }
			// done refreshing
			rc.endRefreshing()
		})
	}

	// all the other normal tableView stuff
	// ...

}