flutter SnackBar 底部消息提示

Posted 2022-06-28 loaderman

具有可选操作的轻量级消息提示，在屏幕的底部显示

文档：https://api.flutter.dev/flutter/material/SnackBar-class.html

demo:

import ‘package:flutter/material.dart‘;

class SnackBarDemo extends StatefulWidget 
  @override
  _SnackBarDemoState createState() => _SnackBarDemoState();


class _SnackBarDemoState extends State<SnackBarDemo> 
  @override
  Widget build(BuildContext context) 
    return Scaffold(
      appBar: AppBar(
        title: Text(‘SnackBarDemo‘),
        elevation: 0.0,
      ),
      body: Container(
        padding: EdgeInsets.all(16.0),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                SnackBarButton(),
              ]
            ),
          ],
        ),
      ),
    );
  


class SnackBarButton extends StatelessWidget 
  @override
  Widget build(BuildContext context) 
    return FlatButton(
      
      child: Text(‘Open SnackBar‘),
      onPressed: () 
        Scaffold.of(context).showSnackBar(
          SnackBar(
            content: Text(‘Processing...‘),
            action: SnackBarAction(
              label: ‘OK‘,
              onPressed: () ,
            ),
           
          )
        );
      ,
    );
  

 效果：