refreshController.swift

private let _refreshControl: UIRefreshControl!

//in addSubviews
tableView.addSubview(refreshControl)

func refreshView() {
    refreshControl.beginRefreshing()
    tableView.reloadData()
    //initData()
    refreshControl.endRefreshing()
}

extension xxxxx: UIViewController {
    var refreshControl: UIRefreshControl {
        if _refreshControl == nil {
            _refreshControl.tintColor = UIColor.grayColor()
            _refreshControl.addTarget(self, action: "refreshView", forControlEvents: .ValueChanged)
        }
    }
}