title: navigation bar button and items not showing in swift 3
body: <p><a href="https://i.stack.imgur.com/gEBSM.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/gEBSM.png" alt="enter image description here"></a></p>
  
  <p>am using navigation bar programmatically in swift, but am not able to show the bar button items in navigation bar,
  this is the code what I did</p>
  
  <pre><code>override func viewDidLoad() {
          super.viewDidLoad()
  
    let navBar: UINavigationBar = UINavigationBar(frame: CGRect(x: 0, y: 0, width: 420, height: 65))
          self.view.addSubview(navBar)
  
          navBar.backgroundColor = hexStringToUIColor("4DC8BD")
  
          let navigationItem = UINavigationItem()
  
         self.title = "Transport APP"
  
          let btn1 = UIButton(type: .custom)
          btn1.setImage(UIImage(named: "Menu1"), for: .normal)
          btn1.frame = CGRect(x: 30, y: 30, width: 30, height: 30)
          btn1.addTarget(self, action: #selector(HomeViewController.menubuttonclick(_:)), for: .touchUpInside)
          let item1 = UIBarButtonItem(customView: btn1)
  
  
           self.navigationItem.setRightBarButtonItems([item1], animated: true)
  
  }
  
      @IBAction func menubuttonclick(_ sender:UIBarButtonItem )
      {
  
          print("this menu button click")
  
      }
  </code></pre>
  
  <p>I can try many ways but am not getting the results
  how to show show bar button item in navigation bar,</p>