Flutter - 如何在 sliver 中显示 markdown 文本

Question

我正在尝试在 SliverList 中运行 Markdown 小部件(包:flutter_markdown 0.2.0)，但我遇到了一些问题。

理想情况下，我想在 Sliver 内的 ExpandTile 小部件内执行 Markdown 小部件，但现在我只想解决 Sliver 的 Markdown child 的问题。

我发布的代码给我带来了问题:

• 我正确地看到了 Markdown 文本，但应用程序被卡住了(我无法滚动，我什么也做不了)。我在使用小部件 MarkdownBody 时有这种行为

• 我在使用小部件 Markdown 时看到一条错误消息:

I/flutter (31761): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
I/flutter (31761): The following assertion was thrown during performResize():
I/flutter (31761): Vertical viewport was given unbounded height.
I/flutter (31761): Viewports expand in the scrolling direction to fill their container.In this case, a vertical
I/flutter (31761): viewport was given an unlimited amount of vertical space in which to expand. This situation
I/flutter (31761): typically happens when a scrollable widget is nested inside another scrollable widget.
I/flutter (31761): If this widget is always nested in a scrollable widget there is no need to use a viewport because
I/flutter (31761): there will always be enough vertical space for the children. In this case, consider using a Column
I/flutter (31761): instead. Otherwise, consider using the "shrinkWrap" property (or a ShrinkWrappingViewport) to size
I/flutter (31761): the height of the viewport to the sum of the heights of its children.
I/flutter (31761):
...

这是我的示例的完整代码:

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

const String _markdownData = """# Markdown Example
Markdown allows you to easily include formatted text, images, and even formatted Dart code in your app.

## Styling
Style text as _italic_, __bold__, or `inline code`.

- Use bulleted lists
- To better clarify
- Your points

## Links
You can use [hyperlinks](hyperlink) in markdown

## Images

You can include images:

![Flutter logo](https://flutter.io/images/flutter-mark-square-100.png#100x100)

## Markdown widget

This is an example of how to create your own Markdown widget:

    new Markdown(data: 'Hello _world_!');

## Code blocks
Formatted Dart code looks really pretty too:

void main() {
  runApp(new MaterialApp(
    home: new Scaffold(
      body: new Markdown(data: markdownData)
    )
  ));
}

Enjoy!
""";

void main() {
  runApp(MaterialApp(
      title: "Markdown Demo",
      home: Scaffold(
          appBar: AppBar(title: const Text('Markdown Demo')),
          body: Container(
              child: CustomScrollView(slivers: <Widget>[
            SliverList(
              delegate:
                  SliverChildListDelegate([Markdown(data: _markdownData)]),
            )
          ])))));
}

编辑:我解决了这个问题

问题出在这行代码中:

![Flutter logo](https://flutter.io/images/flutter-mark-square-100.png#100x100)

图像不存在，这会卡住应用程序。

Answer 1

使用 SliverToBoxAdapter 而不是 SliverList