SnackBar 轻量提示组件

main.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: "SnackBar 示例",
      home: Scaffold(
        appBar: AppBar(
          title: Text('SnackBar 示例'),
        ),
        body: Center(
          child: Text(
            'SnackBar 示例',
            style: TextStyle(fontSize: 28.0),
          ),
        ),
        floatingActionButton: Builder(
          builder: (BuildContext context) {
            return FloatingActionButton(
              child: const Icon(Icons.add),
              onPressed: () {
                Scaffold.of(context).showSnackBar(SnackBar(
                  content: Text('显示 SnackBar'),
                ));
              },
              shape: CircleBorder(),
            );
          },
        ),
        floatingActionButtonLocation: FloatingActionButtonLocation.centerFloat,
      ),
    );
  }
}