Flutter hides the navigation bar while allowing to set the status bar

1  Scaffold (
 2        body: Stack (
 3         children: < Widget > [
 4             transparentAppBar (brightness: Brightness.light), // Brightness transparent navigation bar can be set. BackgroundColor: Colors.transparent, leftItem: Container (),
 5            Container ( ),        
 6        　],
 7  　　　　　),
 8   ),