[英]How to animate the color of AppBar on scroll?
How can I animate the color of my SliverAppBar
as I scroll through the CustomScrollView
?如何在滚动
CustomScrollView
时为SliverAppBar
的颜色设置动画?
Scaffold(
body: CustomScrollView(
controller: _scrollController,
slivers: [
SliverAppBar(...),
buildBody(),
],
),
);
try the following code:试试下面的代码:
ScrollController _scrollController;
Color _appColor = Colors.black;
@override
void initState() {
super.initState();
_scrollController= ScrollController()..addListener(() {
if(_scrollController.position.pixels == 0){
_appColor = Colors.black;
setState(() {});
}
else if(_scrollController.position.pixels == 100){
_appColor = Colors.red;
setState(() {});
}
});
}
Scaffold(
body: CustomScrollView(
controller: _scrollController,
slivers: [
//put _appColor to appbar backgroundColor
SliverAppBar(),
buildBody(),
],
),
);
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