Can we apply rounded borders to SliverAppBar in Flutter? - flutter

Question

[I want to implement this UI with rounded appbar to my shop app] (https://i.stack.imgur.com/YoIIR.jpg)
When I use ClipRRect to apply rounded borders to SliverAppBars I get this error. However, I can apply ClipRRect to normal appBar. I need a sliverAppBar to hide title and only display my tabs when scroll up to save space on screen.
════════ Exception caught by widgets library ═══════════════════════════════════
The following assertion was thrown building RawGestureDetector-[LabeledGlobalKey<RawGestureDetectorState>#782cb](state: RawGestureDetectorState#5a576(gestures: <none>, behavior: opaque)):
A RenderNestedScrollViewViewport expected a child of type RenderSliver but received a child of type RenderClipRRect.
RenderObjects expect specific types of children because they coordinate with their children during layout and paint. For example, a RenderSliver cannot be the child of a RenderBox because a RenderSliver does not understand the RenderBox layout protocol.
The RenderNestedScrollViewViewport that expected a RenderSliver child was created by: NestedScrollViewViewport ← IgnorePointer-[GlobalKey#845ec] ← Semantics ← Listener ← _GestureSemantics ← RawGestureDetector-[LabeledGlobalKey<RawGestureDetectorState>#782cb] ← Listener ← _ScrollableScope ← _ScrollSemantics-[GlobalKey#9de96] ← NotificationListener<ScrollMetricsNotification> ← Transform ← ClipRect ← ⋯
The RenderClipRRect that did not match the expected child type was created by: ClipRRect ← NestedScrollViewViewport ← IgnorePointer-[GlobalKey#845ec] ← Semantics ← Listener ← _GestureSemantics ← RawGestureDetector-[LabeledGlobalKey<RawGestureDetectorState>#782cb] ← Listener ← _ScrollableScope ← _ScrollSemantics-[GlobalKey#9de96] ← NotificationListener<ScrollMetricsNotification> ← Transform ← ⋯
The relevant error-causing widget was
NestedScrollView
lib\…\screens\news_feed.dart:27
When the exception was thrown, this was the stack
Here is my code.
class NewsFeed extends StatelessWidget {
const NewsFeed({Key? key}) : super(key: key);
static const List<Widget> screens = [
RetailsScreen(),
ElonsScreen(),
RentalsScreen(),
];
#override
Widget build(BuildContext context) {
return DefaultTabController(
length: 3,
initialIndex: 0,
child: Scaffold(
backgroundColor: AppColors.semiWhiteBackground,
body: NestedScrollView(
headerSliverBuilder: (context, innerBoxIsScrolled) {
return [
ClipRRect(
borderRadius: const BorderRadius.only(
bottomLeft: Radius.circular(25),
bottomRight: Radius.circular(25),
),
child: SliverAppBar(
title: const LocaleText('newsFeed'),
pinned: true,
floating: true,
forceElevated: innerBoxIsScrolled,
bottom: const TabBar(
indicatorSize: TabBarIndicatorSize.tab,
indicatorWeight: 5,
indicatorColor: AppColors.secondary,
labelStyle: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 16,
),
unselectedLabelStyle: TextStyle(
fontWeight: FontWeight.normal,
fontSize: 15,
),
tabs: [
Tab(
child: LocaleText(
'buyAndSell',
style: TextStyle(color: Colors.white),
),
),
Tab(
child: LocaleText(
'elons',
style: TextStyle(color: Colors.white),
),
),
Tab(
child: LocaleText(
'rental',
style: TextStyle(color: Colors.white),
),
),
],
),
),
),
];
},
body: const TabBarView(
children: screens,
),
),
),
);
}
}
I use a SliverAppBar to be able to hide scrollBar part of the appBar when scrolling up.

Answer 1

Please update your code with :
Remove the ClipRRect from the sliverAppBar and use shape property of sliverAppBar
shape: const ContinuousRectangleBorder(
borderRadius: BorderRadius.only(
bottomLeft: Radius.circular(60),
bottomRight: Radius.circular(60))),
Full code :
NestedScrollView(
headerSliverBuilder: (context, innerBoxIsScrolled) {
return [
SliverAppBar(
title: const Text('newsFeed'),
pinned: true,
floating: true,
shape: const ContinuousRectangleBorder(
borderRadius: BorderRadius.only(
bottomLeft: Radius.circular(60),
bottomRight: Radius.circular(60))),
forceElevated: innerBoxIsScrolled,
bottom: const TabBar(
indicatorSize: TabBarIndicatorSize.tab,
indicatorWeight: 5,
indicatorColor: Colors.yellow,
labelStyle: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 16,
),
unselectedLabelStyle: TextStyle(
fontWeight: FontWeight.normal,
fontSize: 15,
),
tabs: [
Tab(
child: Text(
'buyAndSell',
style: TextStyle(color: Colors.white),
),
),
Tab(
child: Text(
'elons',
style: TextStyle(color: Colors.white),
),
),
Tab(
child: Text(
'rental',
style: TextStyle(color: Colors.white),
),
),
],
),
),
];
},
body: Container(),
),