我很困惑為什么當我滾動 listviewbuilder 時我的 sliverappbar 沒有崩潰
所以我想要的是 Appbar 會崩潰但底部被固定，當我向上滾動時，appbar 也會顯示
@override
Widget build(BuildContext context) {
return SafeArea(
child: Scaffold(
body: CustomScrollView(
slivers: <Widget>[
SliverAppBar(
pinned: true,
snap: true,
floating: true,
expandedHeight: 150,
centerTitle: true,
title: Text('mama'),
bottom: AppBar(
title: Container(
height: 45,
child: TextField(
decoration: InputDecoration(
border: OutlineInputBorder(),
hintText: 'Enter a search term'),
),
),
),
),
SliverList(
delegate: SliverChildBuilderDelegate(
(BuildContext context, int index) {
return Container(
height: MediaQuery.of(context).size.height,
child: StreamBuilder<ListsetorModel>(
stream: con.resListsetor.stream,
builder: (_, snapshot) {
if (snapshot.hasData) {
if (snapshot.data!.result == null) {
return Center(
child: Text('Data kosong '),
);
} else {
return Scrollbar(
thickness: 5,
child: ListView.builder(
itemCount: snapshot.data!.result!.length,
itemBuilder: (context, index) {
var formatDate = DateFormat('yyyy-MM-dd ')
.format(snapshot
.data!.result![index].createdAt!
.toLocal());
Result list =
snapshot.data!.result![index];
return InkWell(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) =>
DetailTransaksi(
kode: list.kode)));
},
child: Container(
child: Card(
shape: RoundedRectangleBorder(
borderRadius:
BorderRadius.circular(9.0),
),
child: Container(
child: Padding(
padding:
const EdgeInsets.all(20.0),
child: Column(
mainAxisAlignment:
MainAxisAlignment.start,
children: [
Container(
child: Row(
mainAxisAlignment:
MainAxisAlignment
.spaceBetween,
children: [
Text(
"Order ${list.kode}",
style: TextStyle(
fontWeight:
FontWeight
.bold),
),
Text(formatDate),
],
),
),
Divider(),
Text(
"Please help us to confirm \nto get 10% discount code for next order."),
SizedBox(
height: 10,
),
Container(
child: Row(
mainAxisAlignment:
MainAxisAlignment
.spaceBetween,
children: [
Container(
width: 96,
height: 36,
color: Color(
0xff85d057),
child: TextButton(
child: Row(
children: [
SizedBox(
width: 5,
),
Text(
"Qr Code",
style: TextStyle(
color: Colors
.white),
),
SizedBox(
height: 20,
width: 20,
child: Image
.asset(
'assets/images/qrscan.png'),
)
],
),
onPressed: () {
Navigator.pushReplacement(
context,
MaterialPageRoute(
builder: (context) => Qrcode(
data: list.kode!,
)));
},
),
),
)
],
),
),
],
),
),
),
),
),
);
}),
);
}
}
return Center(child: CircularProgressIndicator());
}),
);
},
),
),
],
),
),
);
}
所以我希望在滾動串列視圖時 sliverappbar 崩潰，我嘗試在串列視圖構建器上添加物理 neverscrollable 它無法正常作業
uj5u.com熱心網友回復：
請參考以下代碼
class AnimatedAppBar extends StatefulWidget {
const AnimatedAppBar({Key key}) : super(key: key);
@override
_AnimatedAppBarState createState() => _AnimatedAppBarState();
}
class _AnimatedAppBarState extends State<AnimatedAppBar>
with TickerProviderStateMixin {
final TextEditingController stateController = TextEditingController();
final FocusNode stateFocus = FocusNode();
var animation;
var controller;
@override
Widget build(BuildContext context) {
return SafeArea(
child: Scaffold(
body: NestedScrollView(
headerSliverBuilder:
(BuildContext context, bool innnerBoxIsScrolled) {
if (innnerBoxIsScrolled) {
/* Animation */
controller = AnimationController(
vsync: this,
duration: Duration(
seconds: 1,
),
);
animation = Tween(
begin: 0.0,
end: 1.0,
).animate(controller);
/* Animation */
controller.forward();
}
return <Widget>[
SliverAppBar(
expandedHeight: 120.0,
floating: false,
pinned: true,
backgroundColor: Colors.grey,
automaticallyImplyLeading: false,
titleSpacing: 0.0,
toolbarHeight: 90.0,
centerTitle: false,
elevation: 0.0,
leadingWidth: 0.0,
title: Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: [
if (innnerBoxIsScrolled != null &&
innnerBoxIsScrolled == true)
FadeTransition(
opacity: animation,
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: [
SizedBox(
height: 10.0,
),
Text(
"Search",
style: TextStyle(
color: Colors.black,
),
),
Padding(
padding: const EdgeInsets.all(8.0),
child: TextFormField(
autovalidateMode:
AutovalidateMode.onUserInteraction,
/* autovalidate is disabled */
controller: stateController,
inputFormatters: [
FilteringTextInputFormatter.deny(
RegExp(r"\s\s")),
FilteringTextInputFormatter.deny(RegExp(
r'(\u00a9|\u00ae|[\u2000-\u3300]|\ud83c[\ud000-\udfff]|\ud83d[\ud000-\udfff]|\ud83e[\ud000-\udfff])')),
],
keyboardType: TextInputType.text,
maxLength: 160,
onChanged: (val) {},
maxLines: 1,
validator: (value) {},
focusNode: stateFocus,
autofocus: false,
decoration: InputDecoration(
errorMaxLines: 3,
counterText: "",
filled: true,
fillColor: Colors.white,
focusedBorder: OutlineInputBorder(
borderRadius:
BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Color(0xffE5E5E5),
),
),
disabledBorder: OutlineInputBorder(
borderRadius:
BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Color(0xffE5E5E5),
),
),
enabledBorder: OutlineInputBorder(
borderRadius:
BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Color(0xffE5E5E5),
),
),
border: OutlineInputBorder(
borderRadius:
BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
),
),
errorBorder: OutlineInputBorder(
borderRadius:
BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Colors.red,
)),
focusedErrorBorder: OutlineInputBorder(
borderRadius:
BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Colors.red,
),
),
hintText: "Search" ?? "",
),
),
),
SizedBox(
height: 6.0,
)
],
),
),
],
),
// bottom: PreferredSize(
// preferredSize: Size.fromHeight(5.0),
// child: Text(''),
// ),
flexibleSpace: FlexibleSpaceBar(
background: Container(
width: MediaQuery.of(context).size.width,
child: Stack(
alignment: Alignment.center,
children: [
Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
SizedBox(
height: 10.0,
),
Padding(
padding: EdgeInsets.symmetric(
horizontal: 8.0,
),
child: Row(
mainAxisAlignment:
MainAxisAlignment.spaceBetween,
children: [
Text(
"Search",
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 24.0,
),
),
CircleAvatar(
backgroundImage: NetworkImage(
"https://images.ctfassets.net/hrltx12pl8hq/2TRIFRwcjrTuNprkTQHVxs/088159eb8e811aaac789c24701d7fdb1/LP_image.jpg?fit=fill&w=632&h=354&fm=webp"), //NetworkImage
radius: 16.0,
),
],
),
),
Padding(
padding: const EdgeInsets.all(8.0),
child: TextFormField(
autovalidateMode:
AutovalidateMode.onUserInteraction,
/* autovalidate is disabled */
controller: stateController,
inputFormatters: [
FilteringTextInputFormatter.deny(
RegExp(r"\s\s")),
FilteringTextInputFormatter.deny(RegExp(
r'(\u00a9|\u00ae|[\u2000-\u3300]|\ud83c[\ud000-\udfff]|\ud83d[\ud000-\udfff]|\ud83e[\ud000-\udfff])')),
],
keyboardType: TextInputType.text,
maxLength: 160,
onChanged: (val) {},
maxLines: 1,
validator: (value) {},
focusNode: stateFocus,
autofocus: false,
decoration: InputDecoration(
errorMaxLines: 3,
counterText: "",
filled: true,
fillColor: Colors.white,
focusedBorder: OutlineInputBorder(
borderRadius:
BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Color(0xffE5E5E5),
),
),
disabledBorder: OutlineInputBorder(
borderRadius:
BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Color(0xffE5E5E5),
),
),
enabledBorder: OutlineInputBorder(
borderRadius:
BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Color(0xffE5E5E5),
),
),
border: OutlineInputBorder(
borderRadius:
BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
),
),
errorBorder: OutlineInputBorder(
borderRadius:
BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Colors.red,
)),
focusedErrorBorder: OutlineInputBorder(
borderRadius:
BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Colors.red,
),
),
hintText: "Search" ?? "",
),
),
),
],
),
],
),
),
),
),
];
},
body: Builder(
builder: (BuildContext context) {
return SingleChildScrollView(
child: Column(
children: [
ListView.builder(
itemCount: 100,
physics: NeverScrollableScrollPhysics(),
shrinkWrap: true,
itemBuilder: (BuildContext context, int index) {
return Padding(
padding: const EdgeInsets.all(4.0),
child: Text("Index value: $index"),
);
},
)
],
),
);
},
),
),
),
);
}
}
帶有標簽欄的嵌套滾動
class NestedScrollWithTabs extends StatefulWidget {
const NestedScrollWithTabs({Key key}) : super(key: key);
@override
_NestedScrollWithTabsState createState() => _NestedScrollWithTabsState();
}
class _NestedScrollWithTabsState extends State<NestedScrollWithTabs>
with TickerProviderStateMixin {
var animation;
var controller;
@override
Widget build(BuildContext context) {
return SafeArea(
child: Scaffold(
body: DefaultTabController(
length: 2,
child: NestedScrollView(
physics: NeverScrollableScrollPhysics(),
headerSliverBuilder: (headerCtx, innnerBoxIsScrolled) {
if (innnerBoxIsScrolled) {
/* Animation */
controller = AnimationController(
vsync: this,
duration: Duration(
seconds: 1,
),
);
animation = Tween(
begin: 0.0,
end: 1.0,
).animate(controller);
/* Animation */
controller.forward();
}
return <Widget>[
SliverAppBar(
expandedHeight: ScreenUtil().setHeight(185.0),
floating: false,
pinned: true,
backgroundColor: Colors.white,
automaticallyImplyLeading: false,
titleSpacing: 0.0,
centerTitle: true,
elevation: 0.0,
leadingWidth: 0.0,
title: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
if (innnerBoxIsScrolled != null &&
innnerBoxIsScrolled == true)
FadeTransition(
opacity: animation,
child: Text(
"Title",
style: TextStyle(
color: Colors.black,
fontSize: 22,
fontWeight: FontWeight.bold,
),
),
),
],
),
flexibleSpace: FlexibleSpaceBar(
background: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Stack(
alignment: Alignment.center,
clipBehavior: Clip.none,
children: [
Image.network(
"https://images.pexels.com/photos/10181294/pexels-photo-10181294.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500" ??
"",
fit: BoxFit.fitWidth,
height: ScreenUtil().setHeight(126.0),
width: ScreenUtil().screenWidth,
filterQuality: FilterQuality.low,
loadingBuilder: (BuildContext context,
Widget child,
ImageChunkEvent loadingProgress) {
if (loadingProgress == null) return child;
return Container(
height: ScreenUtil().setHeight(126.0),
width: ScreenUtil().screenWidth,
color: Colors.grey,
);
},
errorBuilder: (context, error, stackTrace) {
return SizedBox(
height: ScreenUtil().setHeight(126.0),
width: ScreenUtil().screenWidth,
child: Container(
width: ScreenUtil().screenWidth,
),
);
},
),
Positioned(
top: ScreenUtil().setHeight(92.0),
// left: ScreenUtil().setWidth(20.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: [
CircleAvatar(
backgroundColor: Colors.transparent,
radius: 30.0,
child: ClipRRect(
borderRadius: BorderRadius.circular(
45.0,
),
child: Image.network(
"https://images.pexels.com/photos/10181294/pexels-photo-10181294.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500" ??
"",
fit: BoxFit.fill,
height: ScreenUtil().setHeight(72.0),
width: ScreenUtil().screenWidth,
filterQuality: FilterQuality.low,
loadingBuilder: (BuildContext context,
Widget child,
ImageChunkEvent loadingProgress) {
if (loadingProgress == null)
return child;
return Container(
height:
ScreenUtil().setHeight(72.0),
width: ScreenUtil().screenWidth,
color: Colors.grey,
);
},
errorBuilder:
(context, error, stackTrace) {
return SizedBox(
height:
ScreenUtil().setHeight(72.0),
width: ScreenUtil().screenWidth,
child: Container(
width: ScreenUtil().screenWidth,
),
);
},
),
),
),
Text("Name"),
Text("Place"),
],
),
),
],
),
],
),
),
),
SliverOverlapAbsorber(
handle: NestedScrollView.sliverOverlapAbsorberHandleFor(
headerCtx),
sliver: SliverPersistentHeader(
delegate: SliverAppBarDelegate(TabBar(
labelColor: Colors.blue,
unselectedLabelColor: Colors.black,
labelStyle: TextStyle(
fontSize: 15.0,
),
unselectedLabelStyle: TextStyle(
fontSize: 15.0,
),
labelPadding: EdgeInsets.zero,
indicatorColor: Colors.blue,
indicatorPadding: EdgeInsets.zero,
physics: NeverScrollableScrollPhysics(),
tabs: [
Tab(
text: "Tab 1",
),
Tab(
text: "Tab 2",
),
],
)),
pinned: false,
),
),
];
},
body: TabBarView(
children: [
/* Tab 1 */
Container(
color: Colors.white,
child: ListView.builder(
itemCount: 100,
physics: NeverScrollableScrollPhysics(),
shrinkWrap: true,
itemBuilder: (BuildContext context, int index) {
return Padding(
padding: const EdgeInsets.all(4.0),
child: Text("Index value: $index"),
);
},
),
),
/* Tab 2 */
Container(
color: Colors.white,
child: ListView.builder(
itemCount: 10,
physics: NeverScrollableScrollPhysics(),
shrinkWrap: true,
itemBuilder: (BuildContext context, int index) {
return Padding(
padding: const EdgeInsets.all(4.0),
child: Text("Index value of Tab 2: $index"),
);
},
),
),
],
),
),
),
),
);
}
}
class SliverAppBarDelegate extends SliverPersistentHeaderDelegate {
SliverAppBarDelegate(this.tabBars);
final TabBar tabBars;
@override
double get minExtent => 60.0;
@override
double get maxExtent => 60.0;
@override
Widget build(
BuildContext context, double shrinkOffset, bool overlapsContent) {
// shinkOffsetPerValue.value = shrinkOffset;
return new Container(
color: Colors.white,
child: Column(
children: [
tabBars,
],
),
);
}
@override
bool shouldRebuild(SliverAppBarDelegate oldDelegate) {
return false;
}
}
uj5u.com熱心網友回復：
所以答案是通過添加 NestedScrollview
floatHeaderSlivers: true,
并洗掉snap: true內部 sliverappbar
轉載請註明出處，本文鏈接：https://www.uj5u.com/yidong/395309.html