ios - How to set image for bar button with swift? -

i trying set image bar button item have image like:

with resolution 30 * 30 while assign image bar button looks like:

i have assigned image way :

and if try way making iboutlet button , set image programatically form this question , code is:

 // outlet bar button  @iboutlet weak var fbbutton: uibarbuttonitem!  // set image bar button var backimg: uiimage = uiimage(named: "fb.png")! fbbutton.setbackgroundimage(backimg, forstate: .normal, barmetrics: .default) 

but nothing happend this,

can tell me doing wrong?

or batter way this?

i have achieved programatically code:

import uikit  class viewcontroller: uiviewcontroller {      override func viewdidload() {         super.viewdidload()         //create new button         let button: uibutton = uibutton.buttonwithtype(uibuttontype.custom) as! uibutton         //set image button         button.setimage(uiimage(named: "fb.png"), forstate: uicontrolstate.normal)         //add function button         button.addtarget(self, action: "fbbuttonpressed", forcontrolevents: uicontrolevents.touchupinside)         //set frame         button.frame = cgrectmake(0, 0, 53, 31)          let barbutton = uibarbuttonitem(customview: button)         //assign button navigationbar         self.navigationitem.rightbarbuttonitem = barbutton     }      //this method call when press button.     func fbbuttonpressed() {          println("share fb")     } } 

and result be:

same way can set button left side way:

self.navigationitem.leftbarbuttonitem = barbutton 

and result be:

and if want same transaction navigation controller have when go default button can achieve custom button code:

func backbuttonpressed(sender:uibutton) {     navigationcontroller?.popviewcontrolleranimated(true) } 

for swift 3.0:

import uikit  class viewcontroller: uiviewcontroller {      override func viewdidload() {         super.viewdidload()         //create new button         let button = uibutton.init(type: .custom)         //set image button         button.setimage(uiimage(named: "fb.png"), for: uicontrolstate.normal)         //add function button         button.addtarget(self, action: #selector(viewcontroller.fbbuttonpressed), for: uicontrolevents.touchupinside)         //set frame         button.frame = cgrect(x: 0, y: 0, width: 53, height: 51)          let barbutton = uibarbuttonitem(customview: button)         //assign button navigationbar         self.navigationitem.rightbarbuttonitem = barbutton     }      //this method call when press button.     func fbbuttonpressed() {          print("share fb")     } }