swift - iOS Navigation Back Button -

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i want have button on second view controller have. when loads now, show button want change title else. implemented viewwillappear method invoke showing navigation bar. following didn't work:

 override func viewwillappear(animated: bool) {         super.viewwillappear(animated);         self.navigationcontroller?.navigationbar.hidden = false         self.navigationcontroller?.navigationbar.backitem?.title = "something else"      }

please me change title. should in willappear or viewdidload?

add right before push or popviewcontroller statement in first view:

let backbutton = uibarbuttonitem(title: "something else",style: uibarbuttonitemstyle.plain ,target: nil,action: nil) self.navigationcontroller!.navigationbar.topitem!.backbarbuttonitem = backbutton

or can in second view way:

override func viewwillappear(animated: bool) {     super.viewwillappear(animated);      let backbutton = uibarbuttonitem(title: "something else",style: uibarbuttonitemstyle.plain ,target: nil,action: nil)     self.navigationcontroller!.navigationbar.topitem!.backbarbuttonitem = backbutton }

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