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The subviews of a navigation item are not showing. I have add them as a subview in the ui editor but they do not show up

NavigationViews are funny beasts. I think the subview you add in the editor is actually the rootview. Check the ui.py code:

if classname == 'NavigationView':
        # Special case for ui.NavigationView: Subviews are added to an
        # implicitly-created root view instead of the NavigationView itself.
        root_view = View()
        root_view.name = attrs.get('root_view_name')
        root_view.background_color = _str2color(attrs.get('background_color'), 'white')
        subview_dicts = view_dict.get('nodes', [])
        if subview_dicts:
            for d in subview_dicts:
                subview = _view_from_dict(d, f_globals, f_locals)
                if subview:
                    root_view.add_subview(subview)
            del view_dict['nodes']
        v = NavigationView(root_view)
        v.title_color = _str2color(attrs.get('title_color'))
        v.bar_tint_color = _str2color(attrs.get('title_bar_color'))

This makes it tricky, because navviews dont easily give you access to the rootview. But this should work:

def get_navview_root(navview):
   N=ObjCInstance(navview)
   for v in list(N._rootView().descendantViews()):
      if 'SUIView' in str(v.description()):
         root_view=v.pyObject(argtypes=[],restype=ctypes.py_object)
         return root_view