Scaffold.geometryOf() 使用不包含 Scaffold 的上下文调用

如何解决Scaffold.geometryOf() 使用不包含 Scaffold 的上下文调用

在构建 Builder 时抛出了以下断言： Scaffold.geometryOf() 使用不包含 Scaffold 的上下文调用。

当提供的上下文与其构建函数实际创建要查找的 Scaffold 小部件的上下文来自同一个 StatefulWidget 时，通常会发生这种情况。

请帮助解决这个错误。

import 'package:ecommerce_app/screens/user_info.dart';
import 'package:Flutter/material.dart';

import 'cart.dart';
import 'Feeds.dart';
import 'home.dart';

class BottomBarScreen extends StatefulWidget {
  
  @override
  _BottomBarScreenState createState() => _BottomBarScreenState();
}

class _BottomBarScreenState extends State<BottomBarScreen> {
  late List<Map<String,Widget>> _pages;
  int _selectedPageIndex = 0;

  @override
  void initState() {
    _pages = [
      {
        'page': Home(),},{
        'page': Feeds(),{
        'page': Search(),{
        'page': Cart(),{
        'page': UserInfo(),];
    super.initState();
  }

  void _selectPage(int index) {
    setState(() {
      _selectedPageIndex = index;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: _pages[_selectedPageIndex]['page'],bottomNavigationBar: BottomAppBar(
        // color: Colors.white,shape: CircularNotchedRectangle(),notchMargin: 0.01,clipBehavior: Clip.antiAlias,child: Container(
          height: kBottomNavigationBarHeight * 0.98,child: Container(
            decoration: Boxdecoration(
              color: Colors.white,border: Border(
                top: BorderSide(
                  color: Colors.grey,width: 0.5,),child: BottomNavigationBar(
              onTap: _selectPage,backgroundColor: Theme.of(context).primaryColor,// ignore: deprecated_member_use
              unselectedItemColor: Theme.of(context).textSelectionColor,selectedItemColor: Colors.purple,currentIndex: _selectedPageIndex,items: [
                BottomNavigationBarItem(
                  icon: Icon(Icons.home),// ignore: deprecated_member_use
                  title: Text('Home'),BottomNavigationBarItem(
                  icon: Icon(Icons.RSS_Feed),// ignore: deprecated_member_use
                  title: Text('Feeds'),BottomNavigationBarItem(
                  activeIcon: null,icon: Icon(null),// ignore: deprecated_member_use
                  title: Text('Search'),BottomNavigationBarItem(
                  icon: Icon(
                    Icons.shopping_bag,// ignore: deprecated_member_use
                  title: Text('Cart'),BottomNavigationBarItem(
                  icon: Icon(Icons.person),// ignore: deprecated_member_use
                  title: Text('User'),],floatingActionButtonLocation:
          FloatingActionButtonLocation.miniCenterDocked,floatingActionButton: Padding(
        padding: const EdgeInsets.all(8.0),child: FloatingActionButton(
          hoverElevation: 10,splashColor: Colors.grey,tooltip: 'Search',elevation: 4,child: Icon(Icons.search),onpressed: () => setState(() {
            _selectedPageIndex = 2;
          }),);
  }
}