Has a Cupertino Navigation to show the app bar but need have end drawer

Issue

I’m trying to add the CupertinoNavigationBar with endDrawer, I try to add Gesture Detector on trailing, but isn’t work, shows this:

The following assertion was thrown while handling a gesture:
flutter: `Scaffold.of()` called with a context that does not contain a Scaffold.
flutter: No Scaffold ancestor could be found starting from the context that was passed to `Scaffold.of()`. This
flutter: usually happens when the context provided is from the same StatefulWidget as that whose build

I already tried to add the key to scaffold and try opened with the key, I try too with scaffold context in appbar

AppBar:

Scaffold(
      appBar: CupertinoNavigationBar(
    transitionBetweenRoutes: true,
    trailing: IconButton(
    icon: Icon(Icons.menu),
    onPressed: () { 
        Scaffold.of(context).openEndDrawer();
    },),
    actionsForegroundColor: Colors.white,
    middle: Text('Lejour', style: TextStyle(color: Colors.white)),
          backgroundColor: Theme.of(context).primaryColor),
   endDrawer: DrawerMenu() // my own class,
   body: // ...body

I expect my trailing icon from CupertinoNavigationBar open the endDrawer with
Scaffold.of(context).openEndDrawer();

Solution

This is a common issue when you try to use Scaffold.of(context) . You should read the error log.

No Scaffold ancestor could be found starting from the context that was
passed to Scaffold.of()

To solve your issue, use the Builder widget to generate a new a context.

trailing: Builder(
            builder: (context) {
              return IconButton(
                icon: Icon(Icons.menu),
                onPressed: () {
                  Scaffold.of(context).openEndDrawer();
                },
              );
            },
          ),

Answered By – diegoveloper

Answer Checked By – Pedro (FlutterFixes Volunteer)