AutomaticKeepAliveClientMixin not working with CupertinoSwitch - flutter

Question

I have page where build ListView with CupertinoSwitch.
class NewsPageRegistr extends StatefulWidget {
NewsPageRegistr({Key key, this.model}) : super(key: key);
RegistrationModel model;
#override
_NewsPageRegistrState createState() => _NewsPageRegistrState();
}
class _NewsPageRegistrState extends State<NewsPageRegistr>
with AutomaticKeepAliveClientMixin<NewsPageRegistr> {
#override
bool get wantKeepAlive => true;
var responseV;
List<DigitalNews> digitalNews = [];
#override
void dispose() {
super.dispose();
}
#override
void initState() {
fitchData();
super.initState();
}
fitchData() async {
responseV = await apiRegistrationDataList(DropMenuMode.news);
for (var values in responseV) {
digitalNews.add(DigitalNews.fromJson(values));
}
}
#override
Widget build(BuildContext context) {
super.build(context);
return SingleChildScrollView(
child: SafeArea(
minimum: const EdgeInsets.fromLTRB(25, 0, 25, 0),
child: Column(
mainAxisSize: MainAxisSize.max,
children: <Widget>[
SizedBox(
width: 400,
height: 85,
child: Text(
"Ich möchte folgende Newsletter abonnieren",
textAlign: TextAlign.left,
style: GeneralStyles.titleStyle,
),
),
ListView.builder(
//padding: const EdgeInsets.symmetric(vertical: 8),
physics: const NeverScrollableScrollPhysics(),
shrinkWrap: true,
itemCount: digitalNews.length,
itemBuilder: (context, index) {
return CheckWidget(
title: digitalNews[index].displayName,
subtitle: digitalNews[index].displayDescription,
registrationName: digitalNews[index].name,
index: index,
model: widget.model,
);
}),
Padding(
padding: const EdgeInsets.symmetric(vertical: 8.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.end,
children: [
Container(
child: Row(
mainAxisAlignment: MainAxisAlignment.end,
children: [
OutlinedButton(
style: OutlinedButton.styleFrom(
backgroundColor: GeneralStyles.petrolColor,
),
onPressed: () {
setState(() {});
widget.model.setCurrentPage(2);
},
child: const Text(
"Weiter",
style: TextStyle(
color: Colors.white,
fontWeight: FontWeight.w300,
fontFamily: 'FiraSans'),
)),
],
),
),
],
),
),
],
),
),
);
}
}
I use AutomaticKeepAliveClientMixin but it not working when i jump to next page (on PageView).
I add AutomaticKeepAliveClientMixin on main widget when call PageView, add to CheckWidget and to NewsPageRegistr widget but it not working. when i jump to other page on PageView List NewsPageRegistr state is dispose.
Code of widget:
class CheckWidget extends StatefulWidget {
RegistrationModel model;
bool checker = false;
final Function(String) onChanged;
final String title;
final String subtitle;
final String registrationName;
final int index;
CheckWidget({Key key, this.onChanged, this.title, this.subtitle, this.registrationName, this.index,this.model}) : super(key: key);
#override
State<CheckWidget> createState() => _CheckWidgetState();
}
class _CheckWidgetState extends State<CheckWidget> {
#override
Widget build(BuildContext context) {
return Container(
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Transform.scale(
alignment: Alignment.centerLeft,
scale: 0.8,
child: CupertinoSwitch(
value: widget.checker,
activeColor: GeneralStyles.petrolColor,
onChanged: (bool value) {
setState(() {
widget.checker = value;
if(value == true) {
widget.model.newsPapers[widget.index] = widget.registrationName;
}else {
widget.model.newsPapers[widget.index] = '';
}
});
},
),
),
Expanded(
child: GestureDetector(
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(widget.title.replaceFirst("Newsletter", "").trim(), style:TextStyle(
color: GeneralStyles.blackColor,
fontSize: 15,
fontFamily: 'FiraSans',
fontWeight: FontWeight.w400,
)),
Text(widget.subtitle, style:TextStyle(
color: GeneralStyles.blackColor,
fontSize: 13,
fontFamily: 'FiraSans',
fontWeight: FontWeight.w300,
)),
],
),
onTap: (){
setState(() {
if(widget.checker == false) {
widget.checker = true;
widget.model.newsPapers[widget.index] = widget.registrationName;
}else {
widget.checker = false;
widget.model.newsPapers[widget.index] = '';
}
});
},
),
),
]
),
);
}
}