How to change the color of the back button in a CupertinoNavigationBar in Flutter

Question

I would like to change the color of the back button in my flutter app.

Here is what I have at the moment: Screenshoot

I would like to change the color from light blu to white. I have searched online but found nothing. Here is my code (note my button is create automatically)

@override
  Widget build(BuildContext context) {
    return CupertinoPageScaffold(
      navigationBar: CupertinoNavigationBar(
        heroTag: 'menupage',
        transitionBetweenRoutes: false,
        middle: Text(
          'Menu Page',
          style: kSendButtonTextStyle,
        ),
      ),

Many thanks in advance !

Answer 1

Example

actionsForegroundColor: Colors.white in CupertinoNavigationBar

Do it

return  CupertinoPageScaffold(
      navigationBar: CupertinoNavigationBar(actionsForegroundColor: Colors.white,
        heroTag: 'menupage',
        transitionBetweenRoutes: false,
        middle: Text(
          'Menu Page',
          style: TextStyle(),
        ),
      ), child: Text(''),
    );

Answer 2

I resolved with setting the CupertinoTextThemeData...

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return CupertinoApp(
      theme: CupertinoThemeData(
        primaryColor:
            Colors.white, //change color of the BOTTOM navbar icons when selected
        textTheme: CupertinoTextThemeData(
          primaryColor:
              Colors.white, //change color of the TOP navbar icon

Thanks Lucas for pointing me in the right direction