flutter – 在bottomNavigationBar下显示bottomSheet

在我们的应用程序中,我们使用了bottomSheet和bottomNavigationBar.

bottomSheet出现在bottomNavigationBar上方,有没有办法让它出现在下面？

这是一个示例应用程序：

import 'package:Flutter/material.dart';

void main() {
  runApp(SampleApp());
}

class SampleApp extends StatefulWidget {
  @override
  _SampleAppState createState() => new _SampleAppState();
}

class _SampleAppState extends State<SampleApp> {
  final _scaffoldKey = GlobalKey<ScaffoldState>();
  PersistentBottomSheetController _sheetController;

  @override
  Widget build(BuildContext context) {
    final _showBottomSheet = () {
      _sheetController = _scaffoldKey.currentState.showBottomSheet((context) {
        return Container(
            color: Colors.grey[200],child: Column(mainAxisSize: MainAxisSize.min,children: [
              RadioListTile(dense: true,title: Text('Test'),groupValue: 'test',onChanged: (value) {},value: true),RadioListTile(dense: true,]));
      });
    };

    return MaterialApp(
      home: Scaffold(
        key: _scaffoldKey,appBar: AppBar(
          title: Text('Sample App'),),bottomNavigationBar: Container(
          child: IconButton(
            icon: Icon(Icons.edit),onpressed: _showBottomSheet,);
  }
}

解决方法

您可以使用Column将弹出窗口与底部导航栏组合使用,并使用 Expandable模拟底部工作表行为：

import 'package:Flutter/material.dart';
import 'package:expandable/expandable.dart';

void main() {
  runApp(SampleApp());
}

class SampleApp extends StatefulWidget {
  @override
  _SampleAppState createState() => new _SampleAppState();
}

class _SampleAppState extends State<SampleApp> {

  @override
  Widget build(BuildContext context) {
    buildBottomSheet() {
      return Container(
          color: Colors.grey[200],children: [
            RadioListTile(dense: true,]));
    }

    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Sample App'),body: Container(
          color: Colors.green,bottomNavigationBar: ExpandableNotifier(
          child: Column(
            mainAxisSize: MainAxisSize.min,children: [
              ExpandableButton(
                child: SizedBox(height: 50,child: Center(
                    child: Icon(Icons.edit),Expandable(
                expanded: buildBottomSheet(),],);
  }
}

对于生产应用程序,请考虑使用SafeArea在底部添加适当的填充.