带有Tabs覆盖内容的颤振SliverAppBar
带有Tabs覆盖内容的颤振SliverAppBar
提问于 2019-02-10 20:33:59
我遵循本教程(https://medium.com/@diegoveloper/flutter-collapsing-toolbar-sliver-app-bar-14b858e87abe)创建了一个带有TabBar的CollapsingToolbar。
问题是，当我滚动主体的内容覆盖tabBar。
以下是代码：
@override
Widget build(BuildContext context) {
return Scaffold(
body: DefaultTabController(
length: 2,
child: NestedScrollView(
headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
return <Widget>[
SliverAppBar(
expandedHeight: 200.0,
floating: false,
pinned: true,
flexibleSpace: FlexibleSpaceBar(
centerTitle: true,
title: Text("Collapsing Toolbar",
style: TextStyle(
color: Colors.white,
fontSize: 16.0,
)),
background: Image.network(
"https://images.pexels.com/photos/396547/pexels-photo-396547.jpeg?auto=compress&cs=tinysrgb&h=350",
fit: BoxFit.cover,
)),
),
SliverPersistentHeader(
delegate: _SliverAppBarDelegate(
TabBar(
labelColor: Colors.black87,
unselectedLabelColor: Colors.grey,
tabs: [
Tab(icon: Icon(Icons.info), text: "Tab 1"),
Tab(icon: Icon(Icons.lightbulb_outline), text: "Tab 2"),
],
),
),
pinned: true,
),
];
},
body: Text("Sample text"),
),
),
);代表：
class _SliverAppBarDelegate extends SliverPersistentHeaderDelegate {
_SliverAppBarDelegate(this._tabBar);
final TabBar _tabBar;
@override
double get minExtent => _tabBar.preferredSize.height;
@override
double get maxExtent => _tabBar.preferredSize.height;
@override
Widget build(
BuildContext context, double shrinkOffset, bool overlapsContent) {
return new Container(
child: _tabBar,
);
}
@override
bool shouldRebuild(_SliverAppBarDelegate oldDelegate) {
return false;
}
}对此有什么想法吗？
回答 3
Stack Overflow用户
回答已采纳
发布于 2019-02-12 06:36:06
如果有人遇到同样的问题，我解决这个问题的方法是：视图
示例：
class _MatchFragmentState extends State<MatchFragment> with TickerProviderStateMixin {
TabController primaryTC;
@override
void initState() {
primaryTC = new TabController(length: 3, vsync: this);
super.initState();
}
@override
Widget build(BuildContext context) {
final double statusBarHeight = MediaQuery.of(context).padding.top;
//var tabBarHeight = primaryTabBar.preferredSize.height;
var pinnedHeaderHeight =
//statusBar height
statusBarHeight +
//pinned SliverAppBar height in header
kToolbarHeight;
return Scaffold(
body: NestedScrollViewRefreshIndicator(
onRefresh: onRefresh,
child: ExtendedNestedScrollView(
headerSliverBuilder: (c, f) {
return <Widget>[
SliverAppBar(
pinned: true,
expandedHeight: kExpandedHeight,
title: Text('Title'),
flexibleSpace: FlexibleSpaceBar(
background: Image.network(
"https://images.pexels.com/photos/396547/pexels-photo-396547.jpeg?auto=compress&cs=tinysrgb&h=350",
fit: BoxFit.cover,
))
),
)
];
},
pinnedHeaderSliverHeight: pinnedHeaderHeight,
keepOnlyOneInnerNestedScrollPositionActive: true,
body: Column(
children: <Widget>[
TabBar(
controller: primaryTC,
labelColor: Colors.black87,
unselectedLabelColor: Colors.grey,
tabs: [
Tab(text: "Tab1"),
Tab(text: "Tab2"),
Tab(text: "Tab3"),
],
),
Expanded(
child: TabBarView(
controller: primaryTC,
children: <Widget>[
new Tab1Screen(),
new Tab2Screen(),
new Tab3Screen()
],
),
)
],
)
),
)
);
}
}
Future<Null> onRefresh() {
final Completer<Null> completer = new Completer<Null>();
new Timer(const Duration(seconds: 1), () {
completer.complete(null);
});
return completer.future.then((_) {});
}Stack Overflow用户
发布于 2020-07-17 12:35:33
我花了几天时间找出什么是issue.turn，它可以用上面提到的@niegus的意见1.0.1来修复，尽管他使用的是旧版本，所以它对我不起作用。但我已经修正了最新版本
下面是一个演示gif：
https://giphy.com/gifs/lMyFPbu74ycEaQFB1v
步进实现
1.在pubspec.yaml中添加插件
更新
extended_nested_scroll_view：^3.0.0
2. main.dart中的伪码
import 'dart:async';
import 'package:extended_nested_scroll_view/extended_nested_scroll_view.dart' as extend;
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
var scrollController = ScrollController();
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MatchFragment());
}
}
class MatchFragment extends StatefulWidget {
@override
_MatchFragmentState createState() => _MatchFragmentState();
}
class _MatchFragmentState extends State<MatchFragment> with TickerProviderStateMixin {
TabController primaryTC;
@override
void initState() {
primaryTC = new TabController(length: 2, vsync: this);
super.initState();
}
@override
Widget build(BuildContext context) {
final double statusBarHeight = MediaQuery.of(context).padding.top;
//var tabBarHeight = primaryTabBar.preferredSize.height;
var pinnedHeaderHeight =
//statusBar height
statusBarHeight +
//pinned SliverAppBar height in header
kToolbarHeight;
return Scaffold(
body: DefaultTabController(
length: 2,
child: extend.NestedScrollView(
headerSliverBuilder: (c, f) {
return <Widget>[
SliverAppBar(
pinned: true,
expandedHeight: 200,
title: Text('Title'),
flexibleSpace: FlexibleSpaceBar(
background: Image.network(
"https://images.pexels.com/photos/396547/pexels-photo-396547.jpeg?auto=compress&cs=tinysrgb&h=350",
fit: BoxFit.cover,
))
),
];
},
pinnedHeaderSliverHeightBuilder: () {
return pinnedHeaderHeight;
},
body: Column(
children: <Widget>[
TabBar(
controller: primaryTC,
labelColor: Colors.black87,
unselectedLabelColor: Colors.grey,
tabs: [
Tab(text: "Tab1"),
Tab(text: "Tab2"),
],
),
Expanded(
child: TabBarView(
controller: primaryTC,
children: <Widget>[
Text('This is tab one'),
Text('This is tab one'),
],
),
)
],
)
),
)
);
}
}Stack Overflow用户
发布于 2020-04-03 07:27:54
一个简单的解决方案是给标签头赋予装饰颜色。
为例
Container(
decoration: BoxDecoration(
color: Colors.white,
),
child: tabBar,
);页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/54620763
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