swift - Add a Custom Back Button to a Custom Navigation Bar -

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i have been trying add custom button nav bar being created on load using multi-storyboard set-up, button not appear automatically, plus trying use custom image it.

this have far:

class addfundsmethodtable : uitableviewcontroller {  override func viewdidload() {     super.viewdidload() }  override func didreceivememorywarning() {     super.didreceivememorywarning() }  override func viewwillappear(animated: bool) {     self.stylenavbar() }  func stylenavbar() {     var newnavbar = uinavigationbar(frame: cgrectmake(0,0, cgrectgetwidth(self.view.frame), 100.0))     newnavbar.tintcolor = uicolor.whitecolor()      var navitem = uinavigationitem(title: "choose method")     var backimage = uiimage(named: "backbtn")     var backitem = uibarbuttonitem(image: backimage, style: .plain, target: self, action: "backbutton:")     navitem.leftbarbuttonitem = backitem     newnavbar.setitems([navitem], animated: false)      self.view.addsubview(newnavbar) }  func backbutton(sender: uibarbuttonitem) {     self.navigationcontroller?.poptorootviewcontrolleranimated(true) }

}

in viewdidload write this: 

override func viewdidload() {   super.viewdidload()   self.stylenavbar() }

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