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sized_box_for_whitespace

目录
Lint rule

Use a 'SizedBox' to add whitespace to a layout.

Description

#

The analyzer produces this diagnostic when a Container is created using only the height and/or width arguments.

Example

#

The following code produces this diagnostic because the Container has only the width argument:

dart
import 'package:flutter/material.dart';

Widget buildRow() {
  return Row(
    children: <Widget>[
      const Text('...'),
      Container(
        width: 4,
        child: Text('...'),
      ),
      const Expanded(
        child: Text('...'),
      ),
    ],
  );
}

Common fixes

#

Replace the Container with a SizedBox of the same dimensions:

dart
import 'package:flutter/material.dart';

Widget buildRow() {
  return Row(
    children: <Widget>[
      Text('...'),
      SizedBox(
        width: 4,
        child: Text('...'),
      ),
      Expanded(
        child: Text('...'),
      ),
    ],
  );
}

除非另有说明，文档之所提及适用于 Dart 3.7.3 版本，本页面最后更新时间: 2025-05-08。 查看文档源码 或者 报告页面问题。