不能在标准的ListView小部件上滚动；总是过度渲染150px

Question

列表视图根本不会滚动。错误表示问题出在main.dart文件中，而不是我正在处理的模块中，但这是模块溢出。

尝试了多种方法：

• 主：false，物理：const AlwaysScrollableScroll物理（），控制器：_controller
• 关于制作列表视图的Flutter开发文档
• 关于制作列表视图的中等帖子
• 无数堆栈溢出Qs

这是我的代码：

import 'package:flutter/material.dart';

class Listicle extends StatefulWidget {
  @override
  ListicleState createState() => ListicleState();
}

class ListicleState extends State<Listicle> {
  final List<String> entries = <String>['A', 'B', 'C', 'D', 'E', 'F'];
  final List<int> colorCodes = <int>[600, 500, 100, 600, 500, 100];

  ScrollController _controller = new ScrollController();

  @override
  Widget build(BuildContext context) {
    return Container(
      child: ListView.builder(
        primary: false,
        physics: const AlwaysScrollableScrollPhysics(),
        controller: _controller,
        shrinkWrap: true,
        padding: const EdgeInsets.all(8),
        itemCount: entries.length,
        itemBuilder: (BuildContext context, int index) {
          return Container(
            height: 100,
            color: Colors.amber[colorCodes[index]],
            child: Center(child: Text('Entry ${entries[index]}')),
          );
        }
      )
    );
  }
}

以下是错误：

════════ Exception caught by rendering library ═════════════════════════════════════════════════════
The following assertion was thrown during layout:
A RenderFlex overflowed by 150 pixels on the bottom.

The relevant error-causing widget was: 
  Column file:///Users/christopher/AndroidStudioProjects/test_app/lib/main.dart:76:13
The overflowing RenderFlex has an orientation of Axis.vertical.
The edge of the RenderFlex that is overflowing has been marked in the rendering with a yellow and black striped pattern. This is usually caused by the contents being too big for the RenderFlex.

Consider applying a flex factor (e.g. using an Expanded widget) to force the children of the RenderFlex to fit within the available space instead of being sized to their natural size.
This is considered an error condition because it indicates that there is content that cannot be seen. If the content is legitimately bigger than the available space, consider clipping it with a ClipRect widget before putting it in the flex, or using a scrollable container rather than a Flex, like a ListView.

The specific RenderFlex in question is: RenderFlex#c9341 relayoutBoundary=up1 OVERFLOWING
...  needs compositing
...  parentData: offset=Offset(0.0, 80.0); id=_ScaffoldSlot.body (can use size)
...  constraints: BoxConstraints(0.0<=w<=392.7, 0.0<=h<=679.3)
...  size: Size(392.7, 679.3)
...  direction: vertical
...  mainAxisAlignment: start
...  mainAxisSize: max
...  crossAxisAlignment: center
...  verticalDirection: down
◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤
════════════════════════════════════════════════════════════════════════════════════════════════════

我对飞镖/飞镖非常陌生（从昨天开始），这已经让我感到困惑。

这是一张快照：https://i.stack.imgur.com/qlDMZ.png

Answer 1

发生错误是因为ListView在主轴方向上扩展到最大大小。

解决方案：

正如@rocigno medeiros在评论中正确地说的那样

通过在Scaffold中包装代码，可以使其工作，因为Scaffold限制了ListView的高度。

class Listicle extends StatefulWidget {
  @override
  ListicleState createState() => ListicleState();
}

class ListicleState extends State<Listicle> {
  final List<String> entries = <String>['A', 'B', 'C', 'D', 'E', 'F'];
  final List<int> colorCodes = <int>[600, 500, 100, 600, 500, 100];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        child: ListView.builder(
          primary: false,
          physics: AlwaysScrollableScrollPhysics(),
          shrinkWrap: true,
          padding: const EdgeInsets.all(8),
          itemCount: entries.length,
          itemBuilder: (BuildContext context, int index) {
            return Container(
              height: 100,
              color: Colors.amber[colorCodes[index]],
              child: Center(child: Text('Entry ${entries[index]}')),
            );
          },
        ),
      ),
    );
  }
}

如果你想要默认的滚动行为，也不需要额外的滚动控制器。

更多信息和一个伟大的答案在这里。

Answer 2

这工作：

import 'package:flutter/material.dart';

final Color darkBlue = Color.fromARGB(255, 18, 32, 47);

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData.dark().copyWith(scaffoldBackgroundColor: darkBlue),
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: Center(
          child: Listicle(),
        ),
      ),
    );
  }
}

class Listicle extends StatefulWidget {
  @override
  ListicleState createState() => ListicleState();
}

class ListicleState extends State<Listicle> {
  final List<String> entries = <String>['A', 'B', 'C', 'D', 'E', 'F','G','H'];
  final List<int> colorCodes = <int>[600, 500, 100, 600, 500, 100,100,100];

 @override
  Widget build(BuildContext context) {
    return Container(
      child: ListView.builder(
        primary: false,
        shrinkWrap: true,
        padding: const EdgeInsets.all(8),
        itemCount: entries.length,
        itemBuilder: (BuildContext context, int index) {
          return Container(
            height: 100,
            color: Colors.amber[colorCodes[index]],
            child: Center(child: Text('Entry ${entries[index]}')),
          );
        }
      )
    );
  }
}