How to add custom view on right of navigation bar Swift?

Question

I am trying to add a custom view on right of UINavigationBar. What I tried is the following, but the view is not showing up! Pleas

Answer 1

// creating uiview and add three custom buttons

 func addRightButton(){

    let viewFN = UIView(frame: CGRectMake(0, 0, 180,40))
        viewFN.backgroundColor = UIColor.yellowColor()
    let button1 = UIButton(frame: CGRectMake(0,8, 40, 20))
    button1.setImage(UIImage(named: "notification"), forState: UIControlState.Normal)
    button1.setTitle("one", forState: .Normal)

    button1.addTarget(self, action: #selector(self.didTapOnRightButton), forControlEvents: UIControlEvents.TouchUpInside)

    let button2 = UIButton(frame: CGRectMake(40, 8, 60, 20))
    button2.setImage(UIImage(named: "notification"), forState: UIControlState.Normal)
    button2.setTitle("tow", forState: .Normal)
    let button3 = UIButton(frame: CGRectMake(80, 8, 60, 20))
     button3.setImage(UIImage(named: "notification"), forState: UIControlState.Normal)
    button3.setTitle("three", forState: .Normal)

    button3.addTarget(self, action: #selector(self.didTapOnRightButton), forControlEvents: UIControlEvents.TouchUpInside)

    viewFN.addSubview(button1)
    viewFN.addSubview(button2)
    viewFN.addSubview(button3)


    let rightBarButton = UIBarButtonItem(customView: viewFN)
    self.navigationItem.rightBarButtonItem = rightBarButton

}