UIRefreshControl

// 전역선언
let refreshControl = UIRefreshControl()
 
override func viewDidLoad() {
        super.viewDidLoad()
        // Refresh 기능 활성화시 Target 호출
        refreshControl.addTarget(self, action: #selector(refresh(_:)), for: UIControlEvents.valueChanged)
        // TableView 에 연결
        tableView.addSubview(refreshControl)
    }
 
func refresh(_ sender: AnyObject) {
        // 동작할 코드 입력
 
        // 동작 종료후 Indicator 종료
        refreshControl.endRefreshing()
    }