title: How to add / use default icons to navigation bar
body: <p>I want to use some of default <a href="https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIBarButtonItem_Class/index.html#//apple_ref/c/tdef/UIBarButtonSystemItem" rel="noreferrer">iOS icons</a> i.e.<br>
  <a href="https://i.stack.imgur.com/WGIMp.png" rel="noreferrer"><img src="https://i.stack.imgur.com/WGIMp.png" alt="enter image description here"></a></p>
  
  <p>in navigation bar.<br>
  Basically I don't know how to call image of that item (directly from native library - I know how to download it and place as custom image:)):</p>
  
  <pre><code>   var myButton:UIButton = UIButton.buttonWithType(UIButtonType.Custom) as! UIButton
     myButton.addTarget(self, action: "reload", forControlEvents: UIControlEvents.TouchUpInside)
     myButton.setImage(???, forState: &lt;#UIControlState#&gt;)
  </code></pre>