flutter - Flutter：如何将 FloatingActionButton 放置在持久性底页后面？

Question

我试图弄清楚是否可以将 a 放在 aFloatingActionButton后面，BottomSheet或者换句话说，如何在显示时将底片放在所有东西的前面。我的意思不是模态底页，而是一个持久的底页。所以我的问题是是否有可能实现，或者是否有人可能想要分享一些解决方法。

在这里，您可以看到同时具有持久底部工作表和浮动操作按钮时的实际行为示例。

import 'package:flutter/material.dart';

void main() => runApp(const MyApp());


class MyApp extends StatelessWidget {
  const MyApp({Key key}) : super(key: key);

  static const String _title = 'Flutter Code Sample';

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: _title,
      home: Scaffold(
        floatingActionButton: FloatingActionButton(onPressed: (){},),
        appBar: AppBar(title: const Text(_title)),
        body: const MyStatelessWidget(),
      ),
    );
  }
}

class MyStatelessWidget extends StatelessWidget {
  const MyStatelessWidget({Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Center(
      child: ElevatedButton(
        child: const Text('showBottomSheet'),
        onPressed: () {
          Scaffold.of(context).showBottomSheet<void>(
                (BuildContext context) {
              return Container(
                height: 200,
                color: Colors.amber,
                child: Center(
                  child: Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    mainAxisSize: MainAxisSize.min,
                    children: <Widget>[
                      const Text('BottomSheet'),
                      ElevatedButton(
                          child: const Text('Close BottomSheet'),
                          onPressed: () {
                            Navigator.pop(context);
                          })
                    ],
                  ),
                ),
              );
            },
          );
        },
      ),
    );
  }
}

提前致谢！

标签： flutterfloating-action-button

Answer 1

尝试使用 aStack而body不是floatingActionButton这样：

import 'package:flutter/material.dart';

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({Key key}) : super(key: key);

  static const String _title = 'Flutter Code Sample';

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: _title,
      home: Scaffold(
        appBar: AppBar(title: const Text(_title)),
        body: Stack(
          children: [
            const MyStatelessWidget(),
            Positioned(
              bottom: 10,
              right: 10,
              child: FloatingActionButton(
                onPressed: () {},
              ),
            )
          ],
        ),
      ),
    );
  }
}

class MyStatelessWidget extends StatelessWidget {
  const MyStatelessWidget({Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Center(
      child: ElevatedButton(
        child: const Text('showBottomSheet'),
        onPressed: () {
          Scaffold.of(context).showBottomSheet<void>(
            (BuildContext context) {
              return Container(
                height: 200,
                color: Colors.amber,
                child: Center(
                  child: Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    mainAxisSize: MainAxisSize.min,
                    children: <Widget>[
                      const Text('BottomSheet'),
                      ElevatedButton(
                          child: const Text('Close BottomSheet'),
                          onPressed: () {
                            Navigator.pop(context);
                          })
                    ],
                  ),
                ),
              );
            },
          );
        },
      ),
    );
  }
}