Question

在我们的应用中，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？

以下是一个示例应用：

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, title: Text('Test'), groupValue: 'test', onChanged: (value) {}, value: true),
            ]));
      });
    };

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

Answer 1

添加：useRootNavigator：true，

showModalBottomSheet(
      context: context,
      useRootNavigator: true,
      builder: (context) {},
    );

Answer 2

您可以使用Column将弹出窗口与底部导航栏结合起来，并使用Expandable模拟底部工作表的行为：

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],
          child: Column(mainAxisSize: MainAxisSize.min, children: [
            RadioListTile(dense: true, title: Text('Test'), groupValue: 'test', onChanged: (value) {}, value: true),
            RadioListTile(dense: true, title: Text('Test'), groupValue: 'test', onChanged: (value) {}, value: 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，请考虑使用SafeArea在底部添加适当的填充。

Answer 3

提到您的问题。有同样的问题，找到了更好的解决方案。使用showModalBottomSheet()。它将覆盖底部导航。

在bottomNavigationBar下面显示bottomSheet

3 个答案: