我正在学习制作应用程序。在这里,我试图制作一个页面来显示完整的帖子。问题是页面不是作为一个单元滚动的。
class SinglePostPage extends StatefulWidget {
final Post? post;
const SinglePostPage({Key? key, this.post}) : super(key: key);
@override
State<SinglePostPage> createState() => _SinglePostPageState();
}
class _SinglePostPageState extends State<SinglePostPage> {
@override
Widget build(BuildContext context) {
return Scaffold(
body: Column(
mainAxisSize: MainAxisSize.min,
children: [
Container(
margin: const EdgeInsets.only(top: 22.5),
padding: const EdgeInsets.fromLTRB(0, 5, 0, 6),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
const BackButton(),
Row(
children: [
InkWell(
onTap: () {
showDialog(...);
},
child: CircleAvatar(...),
Container(
padding: const EdgeInsets.only(left: 5.4),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
GestureDetector(
onTap: () {
showDialog(...);
},
child: Text(
widget.post!.author[0].profileName,
),
),
const SizedBox(height: 4),
Text(
showTimeAgo(widget.post!.postTime).toString(),
),
],
),
),
],
),
PopupMenuButton(
icon: const Icon(Icons.more_vert),
itemBuilder: (context) => [...],
),
Container(
margin: const EdgeInsets.fromLTRB(12, 9, 12, 3),
// when the text is longer than the screen height it showed RenderFlex overflowed error so I put constraints. how to show it full and make this scroll
constraints: BoxConstraints(
maxHeight: MediaQuery.of(context).size.height * 0.54,
minHeight: 50),
child: SingleChildScrollView(
child: Text(
widget.post!.postText,
textAlign: TextAlign.start,
),
),
),
Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
if (widget.post!.postMedia.isNotEmpty)
CarouselSlider.builder(...),
const SizedBox(height: 4.5),
if (widget.post!.postMedia.length > 1)
buildDotIndicator(widget.post!.postMedia),
],
),
],
),
),
Container(
// post reactions row
),
CommentBodyWidget(
postId: widget.post!.postId,
),
],
),
);
}
}
我查找了其他答案,并尝试用SingleChildScrollView包装它,但它不起作用,ListView与shrinkWrap: true
也给出了"不正确使用ParentDataWidget"错误。
CommentBodyWidget有一个listview生成器。它会自己滚动,但上面的小部件不会跟着滚动。
我怎么能显示这整个页面和滚动在一起,而不必限制长帖子在一个受约束的容器?请帮助。
可以用SingleChildScrollView
包裹body
和Column
,使用shrinkWrap: true,
和physics: NeverScrollableScrollPhysics(),
。这将解决问题。
return Scaffold(
body: SingleChildScrollView(
child: Column(
children: [
//...
ListView.builder(
itemCount: itemlength,
shrinkWrap: true,
physics: const NeverScrollableScrollPhysics(),
itemBuilder: (context, index) {
return Text("item $index");
},
),
/// instead of listView
...List.generate(itemlength, (index) => Text("itemWidget"))
],
),
),
);
但是我会鼓励你检查CustomScrollView
。
为了使SingleChildScrollView
工作,它的父级的高度应该被定义。您可以通过将SingleChildScrollView
包装在具有定义高度的Container/SizedBox
中,或将其包装在Expanded
小部件中来实现这一点。
将SingleChildScrollView
作为脚手架的主体。此外,建议为ListView设置shrinkwrap: true
,以便它只占用所需的空间,这将避免无限制的高度错误。
所以不用
...
Widget build(BuildContext context) {
return Scaffold(
body: Column(
mainAxisSize: MainAxisSize.min,
children: [
Container(
...
这样做
...
Widget build(BuildContext context)
return Scaffold(
body: SingleChildScrollView(
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
Container(...
我建议你使用CustomScrollView
试试这个:
CustomScrollView(
slivers: [
SliverFillRemaining(
hasScrollBody: false,
child: Column("""HERE PUT YOUR CODE""")
)]
),