BottomSheet
在 Flutter 中使高度跟随项目数(来自 JSON 的数据)是什么?因为我让高度不跟随数据量,而是跟随每部手机屏幕的 1/2。因此,如果手机很长,则底部有空白空间。如果手机短,数据会被下面的屏幕截断。
这是创建 Bottom Sheet 的代码:
void _showModalBottomSheet(AsyncSnapshot<CatlistResult> snapshot) {
showModalBottomSheet(
context: context,
builder: (BuildContext bc) {
return Card(
elevation: 3.0,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.only(topLeft: Radius.circular(15), topRight: Radius.circular(15))),
child: Container(
padding: EdgeInsets.only(left: 16.0, top: 10.0, right: 16.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisSize: MainAxisSize.max,
children: <Widget>[
Container(
margin: EdgeInsets.only(bottom: 10.0),
child: Image.asset('assets/images/main/more_2lines_20dp.png', scale: 3.5),
),
Expanded(
child: GridView.builder(
physics: NeverScrollableScrollPhysics(), //kill scrollable
shrinkWrap: true,
itemCount: snapshot == null ? 0 : snapshot.data.catlist.length,
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 4),
itemBuilder: (BuildContext context, int index) {
var numItems = snapshot.data.catlist[index];
if (numItems.f == 1) {
if (numItems.b == 0) {
return GestureDetector(
child: Card(
elevation: 0.0,
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Image.asset('assets/images/main/cat_${numItems.a}.png', fit: BoxFit.cover, width: 50.0, height: 50.0),
Container(
margin: EdgeInsets.only(top: 10.0),
child: Text(
numItems.c,
maxLines: 2,
textAlign: TextAlign.center,
style: TextStyle(fontSize: 10),
),
),
],
),
),
);
}
}
},
),
),
],
),
),
);
}
);
}
这是我的代码的结果:
最佳答案
问题:
在您正在使用的父 Column
中
mainAxisSize: MainAxisSize.max
您还在此 Column
中使用 Expanded
,如果 GridView
中的项目较少,则会创建空白空间。移除这个 Expanded
小部件。
解决方案:
Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisSize: MainAxisSize.min, // 1st use min not max
children: <Widget>[
Container(...),
GridView.builder(...), // 2nd remove Expanded
],
)
https://stackoverflow.com/questions/56949553/
相关文章:
intellij-idea - 如何启用 Flutter/Dart 语言实验?
authentication - 如何在 Flutter 应用中集成 Azure AD SSO
dart - 如何在 Flutter/Dart 中将参数从命令行传递到 main?
architecture - flutter BLoC : Is using nested Stre
flutter - 通过 Firebase 使用 Google 登录时, 'ApiExpceptio
dart - ScrollController 如何检测滚动开始、停止和滚动?