flutter – 在bottomNavigationBar下显示bottomSheet

2019年7月28日 434次阅读

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, 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,
          ),
        ),
      ),
    );
  }
}

最佳答案 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],
          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(),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

对于生产应用程序,请考虑使用SafeArea在底部添加适当的填充.

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