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(100,200,50)) //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,forControlEvents: .TouchUpInside)

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

let headerView: UIView = UIView(frame: CGRectMake(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

}

更新的答案

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

let frame: CGRect = tableView.frame


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



    DoneBut.addTarget(self,forControlEvents: .TouchUpInside)

    DoneBut.backgroundColor = UIColor.blueColor()




    let headerView: UIView = UIView(frame: CGRectMake(0,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

}

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