how to create bar button or UIButton in tableview header in swift 2.2?

do like

func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? 
{

initially get the frame of your Tableview

let frame: CGRect = tableView.frame

set the frame for UIbutton where is comes in View

let DoneBut: UIButton = UIButton(frame: CGRectMake(100, 0, 200, 50)) //frame.size.width - 60
DoneBut.setTitle("Done", forState: .Normal)
DoneBut.backgroundColor = UIColor.redColor()

if you are using swift 2.2 call the selector as follows

 DoneBut.addTarget(self, action: #selector(ViewController.buttonTapped(_:)), forControlEvents: .TouchUpInside)

if you are using swift 2.1 call the selector as follows

DoneBut.addTarget(self, action: Selector("buttonTapped:"), forControlEvents: .TouchUpInside)button.addTarget(self, action: Selector("buttonTapped:"), forControlEvents: .TouchUpInside)

create the UIView reason viewforHeader returns UIView and add button to that subView

 let headerView: UIView = UIView(frame: CGRectMake(0, 0, frame.size.width, frame.size.height))
headerView.addSubview(DoneBut)
return headerView
}

call method like

func buttonTapped(sender: UIButton) {
//Button Tapped and open your another ViewController

}

Updated answer

func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView?
{

    let frame: CGRect = tableView.frame


    let DoneBut: UIButton = UIButton(frame: CGRectMake(frame.size.width - 200, 0, 150, 50)) //
    DoneBut.setTitle("Done", forState: .Normal)
    DoneBut.backgroundColor = UIColor.redColor()

    DoneBut.addTarget(self, action: #selector(ViewController.buttonTapped(_:)), forControlEvents: .TouchUpInside)

    DoneBut.backgroundColor = UIColor.blueColor()

    let headerView: UIView = UIView(frame: CGRectMake(0, 0, frame.size.width, frame.size.height))
      headerView.backgroundColor = UIColor.redColor()
    headerView.addSubview(DoneBut)
    return headerView
}

func tableView(tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
    return 50.0
}

func buttonTapped(sender: UIButton) {
    //Button Tapped and open your another ViewController

}

output