Flutter ListView.builder 创建额外的高度

Question

我在

ListView

内有一个

DefaultControllerTab

，由于某种原因，它在其上方创建了额外的间距，请检查图像。

脚手架

return Scaffold(
      appBar: AppBar(
        title: Text(album.name ?? ''),
        backgroundColor: context.primary.withOpacity(0.6),
      ),
      body: const Stack(
        children: [
          AlbumHeader(),
          Column(
            children: [
              Expanded(child: SizedBox.expand()),
              Expanded(
                flex: 2,
                child: AlbumContentView(),
              ),
            ],
          ),
        ],
      ),
      floatingActionButton: const RatingFloatingActionButton(),
      extendBodyBehindAppBar: true,
    );

白色容器

小部件

AlbumContentView

是带有圆角的空白，这个：

return DecoratedBox(
      decoration: BoxDecoration(
        borderRadius: const BorderRadius.only(
          topLeft: Radius.circular(32),
          topRight: Radius.circular(32),
        ),
        color: context.background,
      ),
      child: const Padding(
        padding: EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            AlbumRating(),
            SizedBox(
              height: 16,
            ),
            AlbumGenreList(),
            SizedBox(
              height: 16,
            ),
            Expanded(child: AlbumTabView()),
          ],
        ),
      ),
    ).animate().fadeIn();

标签

return DefaultTabController(
      length: 3,
      child: Column(
        children: [
          TabBar(
            indicatorColor: context.primary,
            labelColor: context.primary,
            unselectedLabelColor: context.onSurface.withOpacity(0.6),
            tabs: AlbumTabs.values
                .map(
                  (e) => Tab(
                    icon: Icon(e.icon),
                    text: e.label,
                  ),
                )
                .toList(),
          ),
          const SizedBox(
            height: 16,
          ),
          const Expanded(
            child: Material(
              child: TabBarView(
                children: [
                  AlbumAboutTabContent(),
                  AlbumTracksTabContent(),
                  Icon(Icons.directions_bike),
                ],
              ),
            ),
          ),
        ],
      ),
    );

列表视图小部件

return ListView.builder(
      itemCount: tracks.length,
      itemBuilder: (context, index) => Padding(
        padding: const EdgeInsets.symmetric(vertical: 8),
        child: InkWell(
          onTap: () {},
          borderRadius: BorderRadius.circular(8),
          child: Ink(
            decoration: BoxDecoration(
              borderRadius: BorderRadius.circular(8),
              border: Border.all(color: context.onSurface.withOpacity(0.2)),
            ),
            child: Padding(
              padding: const EdgeInsets.all(8),
              child: Row(
                children: [
                  Text(tracks[index].name!),
                  const Icon(Icons.arrow_outward),
                ],
              ),
            ),
          ),
        ),
      ),
    );

我不知道那个额外的空白是什么，用“？？？”表示 谢谢

Answer 1

ListView 的顶部内边距默认设置为 20.0。如果你在Listview中添加零填充，你的问题就会消失。