我有三个标签。其中一个选项卡用于编辑照片页面（检索 API 中已有的图像，使用该页面中的更新按钮编辑捕获图像并将其返回到 API）。一切正常。但是用相机捕捉图像后，切换到其他选项卡并返回此选项卡（在此状态下不保存），已捕捉图像不显示，仅显示API图像。我再次捕获以保存。尽管我不保存到 API 并更改选项卡，但我想将捕获的图像保留在容器中。
This is picture of my app contain tab bar view which contain edit image tab bar
这是我的标签栏视图 dart 文件。
var width = MediaQuery.of(context).size.width;
final tabText = TextStyle(fontSize: width * 0.03);
return Scaffold(
appBar: new AppBar(
title: new Text(
'EDIT CLIENT',
style: new TextStyle(color: accentColor, fontFamily: 'Dosis'),
),
bottom: PreferredSize(
preferredSize: Size(40, 40),
child: Container(
height: getScreenHeightRation(40.0),
decoration: BoxDecoration(
color: Color(0xFFF0C185),
border: Border.all(color: Colors.grey[600]),
//0xFFF0C185
),
child: TabBar(
indicatorPadding: EdgeInsets.symmetric(horizontal: 40),
//isScrollable: true,
//change here
labelPadding: EdgeInsets.only(left: 10),
indicatorSize: TabBarIndicatorSize.tab,
indicatorColor: Colors.transparent,
indicator: BoxDecoration(
color: Color(0xFFD2A368),
),
tabs: [
Container(
decoration: BoxDecoration(
border: Border(right: BorderSide(color: Colors.grey))),
child: Tab(
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
ImageIcon(
AssetImage('assets/images/icon_ext/menu.png'),
size: 12,
),
SizedBox(
width: 5.0,
),
Text('Customer Data',style: tabText, ),
],
),
),
),
Container(
decoration: BoxDecoration(
border: Border(right: BorderSide(color: Colors.grey))),
child: Tab(
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
ImageIcon(
AssetImage('assets/images/icon_ext/image.png'),
size: 12,
),
SizedBox(
width: 5.0,
),
Text('Profile',style: tabText, )
],
),
),
),
Container(
child: Tab(
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
ImageIcon(
AssetImage('assets/images/icon_ext/placeholder.png'),
size: 12,
),
SizedBox(
width: 5.0,
),
Text('Location',style: tabText, )
],
),
),
)
],
controller: tabController,
),
),
),
iconTheme: new IconThemeData(color: accentColor),
centerTitle: true,
),
body: TabBarView(
controller: tabController,
children: [
EditClientInformation(
customerNo: widget.customerNo,
branchId: _branchId,
defaultBranchId: _defaultBranchId,
userId: _userId,
systemFormatDate: _systemFormatDate,
),
EditClientProfile(
customerNo: widget.customerNo,
branchId: _branchId,
defaultBranchId: _defaultBranchId,
userId: _userId,
systemFormatDate: _systemFormatDate,
),
EditClientMap(
customerNo: widget.customerNo,
branchId: _branchId,
defaultBranchId: _defaultBranchId,
userId: _userId,
systemFormatDate: _systemFormatDate,
),
],
),
);
}
这是捕获图像选项卡。
Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Stack(
children: [
Container(
width: 300.0,
height: 170.0,
decoration: BoxDecoration(
borderRadius: BorderRadius.all(Radius.circular(20)),
border:
Border.all(width: 1, style: BorderStyle.solid),
),
child: Center(
child: Container(
width: 170.0,
height: double.infinity,
decoration: BoxDecoration(
borderRadius: BorderRadius.only(
topRight: Radius.circular(20),
topLeft: Radius.circular(10),
bottomLeft: Radius.circular(10),
bottomRight: Radius.circular(10)),
//border: Border.all(width: 1, style: BorderStyle.solid),
image: DecorationImage(
image: _profileCaptImg == ""
? NetworkImage(_profileImg)
: FileImage(profile),
fit: BoxFit.cover,
),
),
),
),
),
Positioned(
right: 62.0,
top: 0.0,
child: _profileCaptImg != ''
? GestureDetector(
onTap: () {
setState(() {
profile = null;
_profileCaptImg = '';
});
},
child: Container(
width: 20.0,
height: 20.0,
child: Icon(
Icons.close,
color: Colors.white,
size: 20.0,
),
decoration: BoxDecoration(
shape: BoxShape.circle,
color: Colors.black,
),
),
)
: Container(),
),
],
),
Container(
width: 50.0,
height: 50.0,
child: FloatingActionButton(
onPressed: profileImgPicker,
heroTag: null,
child: new Icon(Icons.camera_alt),
)),
],
),
答案 0 :(得分：0)
试试这个解决方案：
/// Add with AutomaticKeepAliveClientMixin:
class _YourWidgetState extends State<YourWidget> with AutomaticKeepAliveClientMixin {
/// Add these 2 lines:
@override
bool get wantKeepAlive => true;
/// Add super.build(context) to your build method
@override
Widget build(BuildContext context) {
super.build(context);
return YourWidgets();
}
}