Flutter 如何将 pushNamed 与 Dismissible Widget 一起使用并查看背景透明第一页

我想使用Push Name从第1页到第2页，并使用Disdisable Widget关闭第2页.

按下按钮时，关闭时会出现黑屏.

当我拉下关闭第2页时，我想看到第1页

我举了this个例子

class FirstScreen extends StatelessWidget {
  const FirstScreen({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('First Screen'),
      ),
      body: Center(
        child: ElevatedButton(
          // Within the `FirstScreen` widget
          onPressed: () {
            // Navigate to the second screen using a named route.
            Navigator.pushNamed(context, '/second');
          },
          child: const Text('Launch screen'),
        ),
      ),
    );
  }
}

class SecondScreen extends StatelessWidget {
  const SecondScreen({super.key});

  @override
  Widget build(BuildContext context) {
    return Dismissible(
      key: UniqueKey(),
      movementDuration: const Duration(milliseconds: 0),
      resizeDuration: const Duration(milliseconds: 1),
      onDismissed: (d) => Navigator.of(context).pop(),
      direction: DismissDirection.down,
      child: Scaffold(
        appBar: AppBar(
          title: const Text('Second Screen'),
        ),
        body: Center(
        child: ElevatedButton(
          // Within the SecondScreen widget
          onPressed: () {
            // Navigate back to the first screen by popping the current route
            // off the stack.
            Navigator.pop(context);
          },
          child: const Text('Go back!'),
        ),
        ),
        
      ),
    );
  }
}

如果我用这个，它就能用了！但我不想用它

Navigator.of(context).push(
              PageRouteBuilder(
              opaque: false,
              pageBuilder: (context, animation, secondaryAnimation) => const SecondScreen(),
            ));

void main() {
   runApp(
       MaterialApp( 
         title: 'Named Routes Demo',
         initialRoute: '/',
         routes: {
             '/': (context) => const FirstScreen(),
             '/second': (context) => const SecondScreen(), }, ), 
       );
 }