Adding refresh for tableView

ViewController.swift

//Declare
@IBOutlet weak var tableView:UITableView!
var refreshControl = UIRefreshControl()

//Adding in viewDidLoad()
refreshControl.addTarget(self, action: #selector(ViewController.refreshEvents), for: .valueChanged)
tableView.addSubView(refreshControl)

//refreshEvents function
func refreshEvents(){
      /*Call method to fetch new data from server
          or do some logic.
       */       
        refreshControl.endRefreshing()
    }