Flutter: Widget State: Is this code safe? - flutter

Question

The code below is an example to illustrate this question. The code below works, however the following line:
class WidgetCustom extends StatefulWidget {
has "WidgetCustom" underlined in green in vsCode, and when the cursor is positioned over it, it shows the message:
"This class (or a class this class inherits from) is marked as #immutable, but one or more of its instance fields are not final".
The code works fine.
Is it safe to use this code?
Is there a way to achieve this without the warning?
import 'package:flutter/material.dart';
class WidgetCustom extends StatefulWidget {
_WidgetCustomState _state;
WidgetCustom({#required int iCount}) {
_state = _WidgetCustomState(iCount);
}
#override
State<StatefulWidget> createState() {
return _state;
}
int get getIcount => _state.iCount;
}
class _WidgetCustomState extends State<WidgetCustom> {
int iCount;
_WidgetCustomState(this.iCount);
#override
Widget build(BuildContext context) {
return Container(
child: Row(children: <Widget>[
Column(
children: <Widget>[
RaisedButton(
child: const Text("Please tap me"),
onPressed: () {
setState(() => iCount = iCount + 1);
}),
SizedBox(height: 40),
Text("Tapped $iCount Times")
],
),
]));
}
}
Edited to add main.dart
import 'package:flutter/material.dart';
import 'widgetCustom.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Custom Widget Demo'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
WidgetCustom _widgetCustom;
String _sMessage = "Fab has not been pressed";
#override
void initState() {
super.initState();
_widgetCustom = WidgetCustom(iCount: 99);
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Column(children: [
_widgetCustom,
SizedBox(height: 40),
Text(_sMessage),
]),
floatingActionButton: FloatingActionButton(
onPressed: _fabPressed,
tooltip: 'Get Value',
child: Icon(Icons.add),
),
);
}
_fabPressed() {
setState(() => _sMessage =
"Value from last button click = ${_widgetCustom.getIcount}");
}
}

Answer 1

Pass the initial value to the constructor when creating the widget as a final value, and then get it from the State class.

Answer 2

Updated code:
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData.dark(),
home: MyHomePage(title: 'Custom Widget Demo'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
WidgetCustom _widgetCustom;
String _sMessage = "Fab has not been pressed";
int _value = 99;
#override
void initState() {
super.initState();
_widgetCustom = WidgetCustom(iCount: _value, function: _update);
}
void _update(int value) {
setState(() {
_value = value;
_widgetCustom = WidgetCustom(iCount: _value, function: _update);
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text(widget.title)),
body: Column(
children: [
_widgetCustom,
SizedBox(height: 40),
Text(_sMessage),
],
),
floatingActionButton: FloatingActionButton(
onPressed: _fabPressed,
tooltip: 'Get Value',
child: Icon(Icons.add),
),
);
}
_fabPressed() {
setState(() => _sMessage = "Value from last button click = ${_value}");
}
}
class WidgetCustom extends StatefulWidget {
final int iCount;
final Function function;
WidgetCustom({#required this.iCount, this.function});
#override
State<StatefulWidget> createState() {
return _WidgetCustomState();
}
}
class _WidgetCustomState extends State<WidgetCustom> {
int _iCount;
#override
void initState() {
super.initState();
_iCount = widget.iCount;
}
#override
Widget build(BuildContext context) {
return Container(
child: Row(
children: <Widget>[
Column(
children: <Widget>[
RaisedButton(child: const Text("Please tap me"), onPressed: (){
_iCount = _iCount + 1;
widget.function(_iCount);
}),
SizedBox(height: 40),
Text("Tapped $_iCount Times")
],
),
],
),
);
}
}