enter image description here我们尝试运行我的颤振代码时遇到了这个异常“A RenderFlex 在底部溢出了 203 个像素”，并且该异常指向我的代码的第一个子列。我已尝试使用 SingleChildScrollView、Expanded 和 Flexible 包装该列，但仍然遇到相同的异常。
..................................... ………………………………………………………………………………………………………………………………………………………………………… 我的代码
@override
Widget build(BuildContext context) {
return Scaffold(
body: AnnotatedRegion<SystemUiOverlayStyle>(
value: SystemUiOverlayStyle.light,
child: Container(
decoration: BoxDecoration(
gradient: LinearGradient(
begin: Alignment.topCenter,
end: Alignment.bottomCenter,
stops: [0.1, 0.4, 0.7, 0.9],
colors: [
Color(0xFF3594DD),
Color(0xFF4563DB),
Color(0xFF5036D5),
Color(0xFF5B16D0),
],
),
),
child: Padding(
padding: EdgeInsets.symmetric(vertical: 40.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
Container(
alignment: Alignment.centerRight,
child: FlatButton(
onPressed: () => print('Skip'),
child: Text(
'Skip',
style: TextStyle(
color: Colors.white,
fontSize: 20.0,
),
),
),
),
Container(
height: 600.0,
child: PageView(
physics: ClampingScrollPhysics(),
controller: _pageController,
onPageChanged: (int page) {
setState(() {
_currentPage = page;
});
},
children: <Widget>[
Padding(
padding: EdgeInsets.all(40.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Center(
child: Image(
image: AssetImage(
'assets/images/onboarding0.png',
),
height: 150.0,
width: 150.0,
),
),
SizedBox(height: 30.0),
Text(
'Connect people\naround the world',
style: kTitleStyle,
),
SizedBox(height: 15.0),
Text(
'Lorem ipsum dolor sit amet, consect adipiscing elit, sed do eiusmod tempor incididunt ut labore et.',
style: kSubtitleStyle,
),
],
),
),
Padding(
padding: EdgeInsets.all(40.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Center(
child: Image(
image: AssetImage(
'assets/images/onboarding1.png',
),
height: 300.0,
width: 300.0,
),
),
SizedBox(height: 30.0),
Text(
'Live your life smarter\nwith us!',
style: kTitleStyle,
),
SizedBox(height: 15.0),
Text(
'Lorem ipsum dolor sit amet, consect adipiscing elit, sed do eiusmod tempor incididunt ut labore et.',
style: kSubtitleStyle,
),
],
),
),
Padding(
padding: EdgeInsets.all(40.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Center(
child: Image(
image: AssetImage(
'assets/images/onboarding2.png',
),
height: 300.0,
width: 300.0,
),
),
SizedBox(height: 30.0),
Text(
'Get a new experience\nof imagination',
style: kTitleStyle,
),
SizedBox(height: 15.0),
Text(
'Lorem ipsum dolor sit amet, consect adipiscing elit, sed do eiusmod tempor incididunt ut labore et.',
style: kSubtitleStyle,
),
],
),
),
],
),
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: _buildPageIndicator(),
),
_currentPage != _numPages - 1
? Expanded(
child: Align(
alignment: FractionalOffset.bottomRight,
child: FlatButton(
onPressed: () {
_pageController.nextPage(
duration: Duration(milliseconds: 500),
curve: Curves.ease,
);
},
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Text(
'Next',
style: TextStyle(
color: Colors.white,
fontSize: 22.0,
),
),
SizedBox(width: 10.0),
Icon(
Icons.arrow_forward,
color: Colors.white,
size: 30.0,
),
],
),
),
),
)
: Text(''),
],
),
),
),
),
bottomSheet: _currentPage == _numPages - 1
? Container(
height: 100.0,
width: double.infinity,
color: Colors.white,
child: GestureDetector(
onTap: () => print('Get started'),
child: Center(
child: Padding(
padding: EdgeInsets.only(bottom: 30.0),
child: Text(
'Get started',
style: TextStyle(
color: Color(0xFF5B16D0),
fontSize: 20.0,
fontWeight: FontWeight.bold,
),
),
),
),
),
)
: Text(''),
);
}
}
答案 0 :(得分：0)
您可以用 Container 包裹第一个 SingleChildScrollView 小部件，然后在检查 Expanded 后删除 _currentPage != _numPages - 1。
您的新代码应该是：
@override
Widget build(BuildContext context) {
return Scaffold(
body: AnnotatedRegion<SystemUiOverlayStyle>(
value: SystemUiOverlayStyle.light,
child: SingleChildScrollView(
child: Container(
decoration: BoxDecoration(
gradient: LinearGradient(
begin: Alignment.topCenter,
end: Alignment.bottomCenter,
stops: [0.1, 0.4, 0.7, 0.9],
colors: [
Color(0xFF3594DD),
Color(0xFF4563DB),
Color(0xFF5036D5),
Color(0xFF5B16D0),
],
),
),
child: Padding(
padding: EdgeInsets.symmetric(vertical: 40.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
Container(
alignment: Alignment.centerRight,
child: FlatButton(
onPressed: () => print('Skip'),
child: Text(
'Skip',
style: TextStyle(
color: Colors.white,
fontSize: 20.0,
),
),
),
),
Container(
height: 600.0,
child: PageView(
physics: ClampingScrollPhysics(),
controller: _pageController,
onPageChanged: (int page) {
setState(() {
_currentPage = page;
});
},
children: <Widget>[
Padding(
padding: EdgeInsets.all(40.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Center(
child: Image(
image: AssetImage(
'assets/images/onboarding0.png',
),
height: 150.0,
width: 150.0,
),
),
SizedBox(height: 30.0),
Text(
'Connect people\naround the world',
style: kTitleStyle,
),
SizedBox(height: 15.0),
Text(
'Lorem ipsum dolor sit amet, consect adipiscing elit, sed do eiusmod tempor incididunt ut labore et.',
style: kSubtitleStyle,
),
],
),
),
Padding(
padding: EdgeInsets.all(40.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Center(
child: Image(
image: AssetImage(
'assets/images/onboarding1.png',
),
height: 300.0,
width: 300.0,
),
),
SizedBox(height: 30.0),
Text(
'Live your life smarter\nwith us!',
style: kTitleStyle,
),
SizedBox(height: 15.0),
Text(
'Lorem ipsum dolor sit amet, consect adipiscing elit, sed do eiusmod tempor incididunt ut labore et.',
style: kSubtitleStyle,
),
],
),
),
Padding(
padding: EdgeInsets.all(40.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Center(
child: Image(
image: AssetImage(
'assets/images/onboarding2.png',
),
height: 300.0,
width: 300.0,
),
),
SizedBox(height: 30.0),
Text(
'Get a new experience\nof imagination',
style: kTitleStyle,
),
SizedBox(height: 15.0),
Text(
'Lorem ipsum dolor sit amet, consect adipiscing elit, sed do eiusmod tempor incididunt ut labore et.',
style: kSubtitleStyle,
),
],
),
),
],
),
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: _buildPageIndicator(),
),
_currentPage != _numPages - 1
? Align(
alignment: FractionalOffset.bottomRight,
child: FlatButton(
onPressed: () {
_pageController.nextPage(
duration: Duration(milliseconds: 500),
curve: Curves.ease,
);
},
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Text(
'Next',
style: TextStyle(
color: Colors.white,
fontSize: 22.0,
),
),
SizedBox(width: 10.0),
Icon(
Icons.arrow_forward,
color: Colors.white,
size: 30.0,
),
],
),
),
)
: Text(''),
],
),
),
),
),
),
bottomSheet: _currentPage == _numPages - 1
? Container(
height: 100.0,
width: double.infinity,
color: Colors.white,
child: GestureDetector(
onTap: () => print('Get started'),
child: Center(
child: Padding(
padding: EdgeInsets.only(bottom: 30.0),
child: Text(
'Get started',
style: TextStyle(
color: Color(0xFF5B16D0),
fontSize: 20.0,
fontWeight: FontWeight.bold,
),
),
),
),
),
)
: Text(''),
);
}