從屏幕底部彈出一個小窗口使用什么 Widget Flutter

Question

我試圖得到一個小的彈出屏幕，當按下某些東西時，它會從屏幕底部彈出，而不是被定向到另一個 dart 文件，並且之前的屏幕可以變暗並被看到。 我已經嘗試搜索小部件，但找不到我正在尋找的小部件。

圖片例如我的意思。

Answer 1

為此使用模態底頁。 請通過此處的文檔點擊此鏈接或 go

例如

import 'package:flutter/material.dart';

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

/// This is the main application widget.
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: const MyStatelessWidget(),
      ),
    );
  }
}

/// This is the stateless widget that the main application instantiates.
class MyStatelessWidget extends StatelessWidget {
  const MyStatelessWidget({Key? key}) : super(key: key);

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