flutter 如何将BorderRadius赋给SliverList

mqkwyuun  于 2022-12-05  发布在  Flutter
关注(0)|答案(8)|浏览(171)

我在项目中使用SliverAppBar和SliverListView。
我需要BorderRadius到我的SliverList，这是我的SliverAppBar的底部。
这里是截图我需要什么：

下面是我的代码：

Scaffold(
    body: CustomScrollView(
      slivers: <Widget>[
        SliverAppBar(
            backgroundColor: Colors.transparent,
            brightness: Brightness.dark,
            actions: <Widget>[
              IconButton(icon: Icon(Icons.favorite), onPressed: () {}),
              IconButton(icon: Icon(Icons.share), onPressed: () {})
            ],
            floating: false,
            pinned: false,
            //title: Text("Flexible space title"),
            expandedHeight: getHeight(context) - MediaQuery.of(context).padding.top,
            flexibleSpace: Container(
              height: double.infinity,
              width: double.infinity,
              decoration: BoxDecoration(
                image: DecorationImage(
                  fit: BoxFit.cover,
                  image: AssetImage("assets/images/Rectangle-image.png")
                )
              ),
            ),
            bottom: _bottomWidget(context),
          ),
           SliverList(
            delegate: SliverChildListDelegate(listview),
          ),
      ],
    ),
  )

因此，使用此代码，UI将如下所示...

可以建议任何其他的方法，我可以采取来实现这种设计。。

flutter

8条答案

按热度按时间
q1qsirdb

q1qsirdb1#

我使用SliverToBoxAdapter实现了这个设计，我的代码如下。

final sliver = CustomScrollView(
  slivers: <Widget>[
    SliverAppBar(),
    SliverToBoxAdapter(
      child: Container(
        color: Color(0xff5c63f1),
        height: 20,
        child: Column(
          mainAxisAlignment: MainAxisAlignment.end,
          children: <Widget>[
            Container(
              height: 20,
              decoration: BoxDecoration(
                color: Colors.white,
                  borderRadius: BorderRadius.only(
                    topLeft: const Radius.circular(20.0),
                    topRight: const Radius.circular(20.0),
                  ),
              ),
            ),
          ],
        ),
      ),
    ),
    SliverList(),
  ],
);

我在SliverToBoxAdapter中使用了2个容器。

SliverToBoxAdapter位于长条应用程序列和长条清单之间。
1.首先我为角边创建一个蓝色（应该是Appbar颜色）容器。
1.然后在蓝色容器内创建一个高度相同的白色容器，并为列表视图使用border-radius。
Preview on dartpad

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xesrikrc

xesrikrc2#

溶液

在撰写本文时，还没有支持此功能的小部件。

之前：


以下是您的默认代码：

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flexible space title',
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return DefaultTabController(
      length: 2,
      child: Scaffold(
        body: CustomScrollView(
          slivers: <Widget>[
            SliverAppBar(
              backgroundColor: Colors.transparent,
              brightness: Brightness.dark,
              actions: <Widget>[IconButton(icon: Icon(Icons.favorite), onPressed: () {}), IconButton(icon: Icon(Icons.share), onPressed: () {})],
              floating: false,
              pinned: false,
              expandedHeight: 250 - MediaQuery.of(context).padding.top,
              flexibleSpace: Container(
                height: 550,
                width: double.infinity,
                decoration: BoxDecoration(
                    image: DecorationImage(
                        fit: BoxFit.cover,
                        image: NetworkImage(
                            'https://images.unsplash.com/photo-1561752888-21eb3b67eb4e?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=967&q=80'))),
              ),
              //bottom: _bottomWidget(context),
            ),
            SliverList(
              delegate: SliverChildListDelegate(_listview(50)),
            ),
          ],
        ),
      ),
    );
  }
}

List _listview(int count) {
  List<Widget> listItems = List();

  listItems.add(Container(
    color: Colors.black,
    height: 50,
    child: TabBar(
      tabs: [FlutterLogo(), FlutterLogo()],
    ),
  ));

  for (int i = 0; i < count; i++) {
    listItems.add(new Padding(padding: new EdgeInsets.all(20.0), child: new Text('Item ${i.toString()}', style: new TextStyle(fontSize: 25.0))));
  }

  return listItems;
}

之后

下面是使用Stack和SliveWidget小部件完成的代码：

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

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flexible space title',
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return DefaultTabController(
      length: 2,
      child: Scaffold(
        body: Stack(
          children: [
            Container(
              height: 550,
              width: double.infinity,
              decoration: BoxDecoration(
                  image: DecorationImage(
                      fit: BoxFit.cover,
                      image: NetworkImage(
                          'https://images.unsplash.com/photo-1561752888-21eb3b67eb4e?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=967&q=80'))),
            ),
            CustomScrollView(
              anchor: 0.4,
              slivers: <Widget>[
                SliverWidget(
                  child: Container(
                    width: double.infinity,
                    height: 100,
                    decoration: BoxDecoration(
                        color: Colors.yellow, borderRadius: BorderRadius.only(topLeft: Radius.circular(30), topRight: Radius.circular(30))),
                    child: TabBar(
                      tabs: [FlutterLogo(), FlutterLogo()],
                    ),
                  ),
                ),
                SliverList(
                  delegate: SliverChildListDelegate(_listview(50)),
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }
}

List _listview(int count) {
  List<Widget> listItems = List();

  for (int i = 0; i < count; i++) {
    listItems.add(
      Container( //NOTE: workaround to prevent antialiasing according to: https://github.com/flutter/flutter/issues/25009
        decoration: BoxDecoration(
            color: Colors.white, //the color of the main container
            border: Border.all(
                //apply border to only that side where the line is appearing i.e. top | bottom | right | left.
                width: 2.0, //depends on the width of the unintended line
                color: Colors.white)),
        child: Container(
          padding: EdgeInsets.all(20),
          color: Colors.white,
          child: new Text(
            'Item ${i.toString()}',
            style: new TextStyle(fontSize: 25.0),
          ),
        ),
      ),
    );
  }

  return listItems;
}

class SliverWidget extends SingleChildRenderObjectWidget {
  SliverWidget({Widget child, Key key}) : super(child: child, key: key);
  @override
  RenderObject createRenderObject(BuildContext context) {
    // TODO: implement createRenderObject
    return RenderSliverWidget();
  }
}

class RenderSliverWidget extends RenderSliverToBoxAdapter {
  RenderSliverWidget({
    RenderBox child,
  }) : super(child: child);

  @override
  void performResize() {}

  @override
  void performLayout() {
    if (child == null) {
      geometry = SliverGeometry.zero;
      return;
    }
    final SliverConstraints constraints = this.constraints;
    child.layout(constraints.asBoxConstraints(/* crossAxisExtent: double.infinity */), parentUsesSize: true);
    double childExtent;
    switch (constraints.axis) {
      case Axis.horizontal:
        childExtent = child.size.width;
        break;
      case Axis.vertical:
        childExtent = child.size.height;
        break;
    }
    assert(childExtent != null);
    final double paintedChildSize = calculatePaintOffset(constraints, from: 0.0, to: childExtent);
    final double cacheExtent = calculateCacheOffset(constraints, from: 0.0, to: childExtent);

    assert(paintedChildSize.isFinite);
    assert(paintedChildSize >= 0.0);
    geometry = SliverGeometry(
      scrollExtent: childExtent,
      paintExtent: 100,
      paintOrigin: constraints.scrollOffset,
      cacheExtent: cacheExtent,
      maxPaintExtent: childExtent,
      hitTestExtent: paintedChildSize,
    );
    setChildParentData(child, constraints, geometry);
  }
}
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ncgqoxb0

ncgqoxb03#

使用Stack。这是我找到并使用过的最好、最流畅的方法。Preview

import 'dart:math';
import 'package:agro_prep/views/structure/constant.dart';
import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';

class CropDetailsPage extends StatelessWidget {
  const CropDetailsPage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: CustomScrollView(
        slivers: [
          SliverAppBar(
            backgroundColor: Colors.white,

            actions: <Widget>[
              IconButton(icon: Icon(Icons.share), onPressed: () {})
            ],
            floating: false,
            pinned: false,
            //title: Text("Flexible space title"),
            expandedHeight: 281.h,
            flexibleSpace: Stack(
              children: [
                const Positioned.fill(
                  child: FadeInImage(
                    image: NetworkImage(tempImage),
                    placeholder: const NetworkImage(tempImage),
                    // imageErrorBuilder: (context, error, stackTrace) {
                    //   return Image.asset('assets/images/background.jpg',
                    //       fit: BoxFit.cover);
                    // },
                    fit: BoxFit.cover,
                  ),
                ),
                Positioned(
                  child: Container(
                    height: 33.h,
                    decoration: const BoxDecoration(
                      color: Colors.white,
                      borderRadius: BorderRadius.vertical(
                        top: Radius.circular(40),
                      ),
                    ),
                  ),
                  bottom: -7,
                  left: 0,
                  right: 0,
                )
              ],
            ),
          ),
          SliverList(
              delegate: SliverChildBuilderDelegate((context, index) {
            return ListTile(
              tileColor: whiteColor,
              title: Text(Random().nextInt(100).toString()),
            );
          }, childCount: 15))
        ],
      ),
    );
  }
}
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2nbm6dog

2nbm6dog4#

对我有用！

SliverAppBar(
            pinned: true,
            floating: false,
            centerTitle: true,
            title: TextWidget(detail.title,
              weight: FontWeight.bold
            ),
            expandedHeight: MediaQuery.of(context).size.height/2.5,
            flexibleSpace: FlexibleSpaceBar(
              centerTitle: true,
              collapseMode: CollapseMode.parallax,
              background: Stack(
                children: [
                 // Carousel images
                  Swiper(
                      itemWidth: MediaQuery.of(context).size.width,
                      itemHeight: MediaQuery.of(context).size.height /3.5,
                      itemCount: 2,
                      pagination:  SwiperPagination.dots,
                      loop: detail.banners.length > 1,
                      itemBuilder: (BuildContext context, int index) {
                        return Image.network(
                            'https://image.com?image=123.png',
                            fit: BoxFit.cover
                        );
                      }
                  ),
                  //Border radius 
                  Align(
                    alignment: Alignment.bottomCenter,
                    child: Container(
                      color: Colors.transparent,
                      height: 20,
                      child: Column(
                        mainAxisAlignment: MainAxisAlignment.end,
                        children: <Widget>[
                          Container(
                            height: 10,
                            decoration: BoxDecoration(
                              color: Colors.white,
                              borderRadius: BorderRadius.only(
                                topLeft: const Radius.circular(10),
                                topRight: const Radius.circular(10),
                              ),
                            ),
                          ),
                        ],
                      ),
                    ),
                  )
                ],
              ),
            ),
          )
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mf98qq94

mf98qq945#

这个想法是好的，但在某些情况下看起来很奇怪。
可以将borderRadius赋给列表中的第一个元素

Container(
  decoration: BoxDecoration(
    borderRadius: BorderRadius.only(
      topRight: Radius.circular(index == 0 ? 15 : 0),
      topLeft: Radius.circular(index == 0 ? 15 : 0),
    ),
  ),
)

希望这对某人有帮助

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qvtsj1bj

qvtsj1bj6#

试试这个，这是一个简单的解决方案

import 'package:flutter/material.dart';

class SliveR extends StatelessWidget {
  const SliveR({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Stack(
        children: [
          SizedBox(
            width: double.infinity,
            child: Image.network(
              'https://images.unsplash.com/photo-1517248135467-4c7edcad34c4?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2700&q=80',
              fit: BoxFit.cover,
              height: MediaQuery.of(context).size.height * 0.35,
            ),
          ),
          Align(
            alignment: Alignment.topCenter,
            child: Container(
              decoration: const BoxDecoration(
                borderRadius: BorderRadius.all(Radius.circular(30)),
              ),
              child: ClipRRect(
                borderRadius: const BorderRadius.all(Radius.circular(30)),
                child: CustomScrollView(
                  anchor: 0.3,
                  slivers: [
                    SliverToBoxAdapter(
                      child: Container(
                        height: 900,
                        decoration: const BoxDecoration(
                          color: Colors.white,
                          borderRadius: BorderRadius.only(
                            topLeft: Radius.circular(40.0),
                            topRight: Radius.circular(40.0),
                          ),
                          boxShadow: [
                            BoxShadow(
                              color: Colors.grey,
                              offset: Offset(0.0, 1.0), //(x,y)
                              blurRadius: 16.0,
                            ),
                          ],
                        ),
                        child: const Center(
                          child: Text(
                            'Hello',
                            style: TextStyle(color: Colors.grey),
                          ),
                        ),
                      ),
                    )
                  ],
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }
}
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rekjcdws

rekjcdws7#

FlexibleSpaceBar(
              title: CustomText(
                  text: "Renaissance Concourse Hotel",
                  textSize: kSubtitle3FontSize,
                  fontWeight: kBold),
              centerTitle: true,
              collapseMode: CollapseMode.pin,
              background: Stack(
                children: [
                  CachedNetworkImage(
                    imageUrl:
                        "url",
                    width: DeviceUtils.getWidth(context),
                    fit: BoxFit.cover,
                    placeholder: (context, url) => const Center(
                      child: CircularProgressIndicator(),
                    ),
                    errorWidget: (context, url, error) =>
                        const Icon(Icons.error_rounded),
                  ),
                  Positioned(
                    bottom: 50,
                    right: 0,
                    left: 0,
                    child: ContainerPlus(
                      color: kWhiteColor,
                      child: const SizedBox(
                        height: 20,
                      ),
                      radius: RadiusPlus.only(
                        topLeft: kBorderRadiusValue10,
                        topRight: kBorderRadiusValue10,
                      ),
                    ),
                  )
                ],
              ))

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p1iqtdky

p1iqtdky8#

所以最好的方法是在SliverAppBar中使用“bottom”属性。这会将您的圆角容器添加到appbar的底部/sliverlist的开头

bottom: PreferredSize(
                preferredSize: const Size.fromHeight(24),
                child: Container(
                  width: double.infinity,
                  decoration: const BoxDecoration(
                    borderRadius: BorderRadius.vertical(
                      top: Radius.circular(12),
                    ),
                    color: Colors.white,
                  ),
                  child: Column(
                    children: [
                      Padding(
                        padding: const EdgeInsets.symmetric(vertical: 10),
                        child: Container(
                          width: 40,
                          height: 4,
                          decoration: BoxDecoration(
                            color: Colors.black,
                            borderRadius: BorderRadius.circular(2),
                          ),
                        ),
                      ),
                    ],
                  ),
                ),
              ),
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