title: How do I obtain the height of UINavigationBar.navigationItem programmatically?
body: <p>I am creating a custom <code>UIToolbar</code> to use as a <code>UIView</code> in the <code>UINavigationBar.navigationitem.titleView</code> property. I would like to size the toolbar height to that of the .navigationitem by obtaining the current height of the .navigationitem rather than hard code it. Is there a way to obtain the height value?</p>