Flutter: Continuation of the future - flutter

Question

I go from page 1 to page 2. The counting process starts on page 2. As this continues, I return to page 1. Even if I exit page 2, the process continues. Why is this happening? How can I prevent this?
Future.delayed keeps working when I return to page 1 from page 2.
This is page 1. There is only one button to go to page 2.
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:untitled1/page2.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
#override
void initState() {
// TODO: implement initState
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
TextButton(
style: TextButton.styleFrom(
backgroundColor: Colors.black38,
),
onPressed: (){
Navigator.push(context, MaterialPageRoute(builder: (context) => Page2()));
},
child: Text(
'Page 2',
),
),
],
),
),
);
}
}
This is page 2.
import 'package:flutter/material.dart';
class Page2 extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: MyHomePage2(),
);
}
}
class MyHomePage2 extends StatefulWidget {
#override
_MyHomePage2State createState() => _MyHomePage2State();
}
class _MyHomePage2State extends State<MyHomePage2> {
int d=0;
#override
void initState() {
// TODO: implement initState
for (int c = 0; c < 25; c++) {
Future.delayed(Duration(seconds: c), () {
setState(() {
d++;
});
});
}
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
' $d',
),
],
),
),
);
}
}

Answer 1

if(!mounted){
return;
}
It happened thanks to the above. If I write one, it will probably suffice. I don't know if this is a valid solution.
void initState() {
// TODO: implement initState
for (int c = kk; c < 25; c++) {
if(!mounted){
return;
}
Future.delayed(Duration(seconds: c), () {
if(!mounted){
return;
}
setState(() {
d++;
});
});
if(!mounted){
return;
}
}
super.initState();
}