Flutter中'background'已弃用，如何修改代码解决该警告？

警告内容 #

'background' is deprecated and shouldn't be used. Use surface instead. This feature was deprecated after v3.18.0-0.1.pre.
Try replacing the use of the deprecated member with the replacement

原代码 #

import 'package:flutter/material.dart';

// light mode
ThemeData lightMode = ThemeData(
  brightness: Brightness.light,
  colorScheme: ColorScheme.light(
    background: Colors.grey.shade300,
    primary: Colors.grey.shade200,
    secondary: Colors.grey.shade400,
    inversePrimary: Colors.grey.shade800,
  )
);

修复方案 #

从Flutter v3.18.0-0.1.pre版本开始，ColorScheme中的background属性被废弃，官方推荐用surface替代，只需完成两处修改：

1. 更新ThemeData里的ColorScheme定义
   把background替换为surface：

import 'package:flutter/material.dart';

// light mode
ThemeData lightMode = ThemeData(
  brightness: Brightness.light,
  colorScheme: ColorScheme.light(
    surface: Colors.grey.shade300, // 替换background为surface
    primary: Colors.grey.shade200,
    secondary: Colors.grey.shade400,
    inversePrimary: Colors.grey.shade800,
  )
);

2. 修改调用该属性的代码
   将原来调用background的部分替换为surface：

backgroundColor: Theme.of(context).colorScheme.surface

修改完成后警告即可消除，surface的作用和原background完全一致，用于设置界面背景色。

内容的提问来源于stack exchange，提问作者user3523406