Flutter|ListView-hasSize

Question

伙计们！需要你帮忙。我在 AlertDialog 中有 ListView:

ListView.builder(
           itemExtent: 140,
           shrinkWrap: true,
           scrollDirection: Axis.horizontal,
           itemCount: tasks.length,
           itemBuilder: (context, index) {
             var tagTwoList = tasks[index].tagTwo;
             return ListTile(
                     visualDensity: VisualDensity.compact,
                     selected: index == _selectedIndex,
                     selectedTileColor: Colors.indigo.withOpacity(0.7),
                     title: Center(
                         child: tagTwoList),
                     onTap: () {
                       setState(() {
                         _selectedIndex = index;
                       });
                     },
                   );
           }),

我尝试使用谷歌搜索，但那里列出的提示没有帮助或无法正常工作。示例：我尝试使用 Expanded、Row、Expanded inside Row。现在它可以与 SizedBox 一起使用，但它看起来很糟糕，当被选中时，整个 SizedBox 都被选中：

如果删除 SizedBox，则会出现错误：

RenderBox was not laid out: RenderPhysicalShape#1564b relayoutBoundary=up2 'package:flutter/src/rendering/box.dart': Failed assertion: line 1982 pos 12: 'hasSize'

Answer 1

我找不到合适的解决方案，所以我稍微修正了显示，现在代码如下所示。

SizedBox(
              width: MediaQuery.of(context).size.width,
              height: MediaQuery.of(context).size.height -727,
              child: ListView.builder(
                  shrinkWrap: true,
                  scrollDirection: Axis.horizontal,
                  itemCount: tagTwoContainer.length,
                  itemBuilder: (context, index) {
                    var tagTwoList = tasks[index].tagTwo;
                    return SizedBox(
                      height: MediaQuery.of(context).size.height, width: 170,
                      child: ListTile(
                        visualDensity: VisualDensity.compact,
                        selected: index == _selectedIndex,
                        selectedTileColor: Colors.indigo.withOpacity(0.6),
                        title: tagTwoList,
                        onTap: () {
                          setState(() {
                            _selectedIndex = index;
                          });
                        },
                      ),
                    );
                  }),
            ),

Flutter|ListView-hasSize

Flutter|ListView - hasSize

flutter

dart

user-interface