title: navcontroller - Setting up Navigation Item as image
body: <p>I would like to setup the navigation controller bar button item to be an image.</p>
  
  <p>I have read the following - <a href="https://stackoverflow.com/questions/328352/add-image-to-a-navigationitems-title">Add image to a navigationItem&#39;s title</a></p>
  
  <p>I understand how to setup this as an image. I am actually looking to set this up as the setting cog, within the bar button item (like a cog icon). I have seen this before in other apps, I would like to know if there is a default style to initialise for this or normally if this is achieved by the image route as above. </p>
  
  <p>If this is above, does anyone know where this (kind of) default image styled icon is available, or would I need to make one?</p>