Question

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

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

我发布的代码给我一些问题：

我可以正确看到降价文字，但应用程序被冻结（我无法滚动，什么也不能做）。使用小部件MarkdownBody
使用小部件Markdown时看到错误消息：

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：我已解决问题

问题出在这行代码中：

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

图片不存在，这会冻结应用程序。

Answer 1

使用SliverToBoxAdapter而不是SliverList

Flutter-如何以银条显示降价文本

1 个答案: