如何在Flutter中实现嵌套的ListView?

wribegjk  于 2022-12-05  发布在  Flutter
关注(0)|答案(9)|浏览(189)

实现嵌套ListView(或者换句话说,可以包含在可滚动父控件中的ListView Widget)的首选方法是什么?
想象一个“报告”页面,其中的一个部分是一个逐项列出的列表。

ymzxtsji

ymzxtsji1#

对于子ListView,请使用该参数:

shrinkWrap: true,
physics: ClampingScrollPhysics(),
xzabzqsa

xzabzqsa2#

添加physics: ClampingScrollPhysics()shrinkWrap: true对我来说很有用。

样本代码:

@override
Widget build(BuildContext context) {
  return Container(
    child: Column(
      mainAxisSize: MainAxisSize.min,
      children: <Widget>[
        Expanded(
          child: ListView.builder(
              shrinkWrap: true,
              itemCount: 123,
              itemBuilder: (BuildContext context, int index) {
                return Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: <Widget>[
                    Text('Parent'),
                    ListView.builder(
                        itemCount: 2,
                        physics: ClampingScrollPhysics(), 
                        shrinkWrap: true,
                        itemBuilder: (BuildContext context, int index) {
                          return Text('Child');
                        }),
                  ],
                );
              }),
        )
      ],
    ),
  );
}
6gpjuf90

6gpjuf903#

如果希望内部ListView可以独立于主滚动视图滚动,则应使用NestedScrollView。否则,请使用CustomScrollView
下面是说明NestedScrollView方法的一些代码。

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',
      theme: new ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: new MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      body: new NestedScrollView(
        headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
          return <Widget>[
            new SliverAppBar(
              pinned: true,
              title: new Text('Flutter Demo'),
            ),
          ];
        },
        body: new Column(
          children: <Widget>[
            new FlutterLogo(size: 100.0, colors: Colors.purple),
            new Container(
              height: 300.0,
              child: new ListView.builder(
                itemCount: 60,
                itemBuilder: (BuildContext context, int index) {
                  return new Text('Item $index');
                },
              ),
            ),
            new FlutterLogo(size: 100.0, colors: Colors.orange),
          ],
        ),
      ),
    );
  }
}
0tdrvxhp

0tdrvxhp4#

屏幕截图:

代码:

var _container = Container(
  height: 200,
  color: Colors.blue,
  margin: EdgeInsets.symmetric(vertical: 10),
);

@override
Widget build(BuildContext context) {
  return Scaffold(
    appBar: AppBar(title: Text("ListView")),
    body: Padding(
      padding: const EdgeInsets.all(40.0),
      child: ListView( // parent ListView
        children: <Widget>[
          _container,
          _container,
          Container(
            height: 200, // give it a fixed height constraint
            color: Colors.teal,
            // child ListView
            child: ListView.builder(itemBuilder: (_, i) => ListTile(title: Text("Item ${i}"))),
          ),
          _container,
          _container,
          _container,
        ],
      ),
    ),
  );
}
ryoqjall

ryoqjall5#

对于内部列表视图,我刚刚添加了下面的代码,它为我解决了

shrinkWrap: true,
physics: ScrollPhysics(),
q8l4jmvw

q8l4jmvw6#

感谢塞尔达尔Polat:

ListView.builder( // outer ListView
  itemCount: 4,
  itemBuilder: (_, index) {
    return Column(
      children: [
        Container(
          color: Colors.blue,
          alignment: Alignment.center,
          child: Text('Header $index'),
        ),
        ListView.builder( // inner ListView
          shrinkWrap: true, // 1st add
          physics: ClampingScrollPhysics(), // 2nd add
          itemCount: 10,
          itemBuilder: (_, index) => ListTile(title: Text('Item $index')),
        )
      ],
    );
  },
)
huus2vyu

huus2vyu7#

我用这个:

scrollController.addListener(onScroll);

void onScroll(){
    if(scrollController.offset == 0.0
        || scrollController.position.extentBefore == 0.0
        || scrollController.position.extentAfter == 0.0){
      scrollPhysics = NeverScrollableScrollPhysics();

      Future.delayed(Duration(seconds: 1), (){
        scrollPhysics = ClampingScrollPhysics();
        setState((){});
      });

      setState((){});;
    }
  }
8ftvxx2r

8ftvxx2r8#

Expanded(
                  child: ListView.builder(
                      shrinkWrap: true,
                      padding: const EdgeInsets.all(8),
                      itemCount: requestList.length,

                      itemBuilder: (BuildContext context, int index) {
                        int que = index;
                        return Column(
                          crossAxisAlignment: CrossAxisAlignment.start,
                          children: <Widget>[
                            Container(
                                padding: const EdgeInsets.only(
                                    left: 20,
                                    top: 10,
                                    bottom: 10,
                                    right: 20),
                                child: Text(
                                  '${que++} . ${requestList[index].question}',
                                  textAlign: TextAlign.center,
                                  style: TextStyle(
                                    fontSize: 14,
                                    color: HexColor(HexColor.black),
                                    fontFamily: 'montserrat_regular',
                                    decoration: TextDecoration.none,
                                  ),
                                )),
                            ListView.builder(
                                itemCount: requestList[index].questionOptions!.length,
                                physics: ClampingScrollPhysics(),
                                shrinkWrap: true,
                                itemBuilder: (BuildContext context, int subindex) {
                                  return Row(
                                    children: <Widget>[
                                      Radio(
                                          value: 1,
                                          groupValue: radio_value[index],
                                          onChanged: (values) async {
                                            setState(() {
                                              radio_value[index] = 1;
                                              qutionCheckModel[index].response =
                                              "yes";
                                            });
                                          }),
                                      Container(
                                        child: Text(
                                          requestList[index].questionOptions![subindex],
                                          textAlign: TextAlign.center,
                                          style: TextStyle(
                                            fontSize: 14,
                                            color: HexColor(HexColor.black),
                                            fontFamily: 'montserrat_regular',
                                            decoration: TextDecoration.none,
                                          ),
                                        ),
                                      ),

                                    ],
                                  );
                                }),
                          ],
                        );
                      }),
                ),

mzsu5hc0

mzsu5hc09#

使用shrinkWrap Package 内容,使用ClampingScrollPhysics使用父滚动条

ListView.builder(
    shrinkWrap: true,
    physics: const ClampingScrollPhysics(),
    itemCount: yourList.length,
    itemBuilder: (context, index) => YourWidget(items[index]),
),

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