TextFormField not focused after enabling it - flutter

Question

I do not see a blinking cursor if I enable and focus a previous disabled TextFormField. In this example, the TextFormField is originally disabled, as indicated by the _enabled state variable, and when you click on the enable button, the field is enabled and focused but the blinking cursor is not visible. I have to click on the TextFormField in order to see the blinking cursor.
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key}) : super(key: key);
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
bool _enabled = false;
FocusNode focusNodeA = FocusNode();
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Test'),
),
body: TextFormField(
enabled: _enabled,
focusNode: focusNodeA,
),
floatingActionButton: FloatingActionButton(
onPressed: () {
setState(() => _enabled = true);
FocusScope.of(context).requestFocus(focusNodeA);
},
child: Text('Enable'),
),
);
}
}
If I press 'Enable' twice, the cursor is shown.
If the TextFormField was already enabled and then focused, the blinking cursor is visible.

Answer 1

1- you focused after setState so it not working.
just do like below
2- you can't focus widget until disabled and when you enabling widget. when you do focusing and enabling at same time in ui tread it's try focusing before enabling because of their rendering time.if you post some delay to focusing the problem get solving.
setState(() {
Future.delayed(const Duration(milliseconds: 10), ()
{
FocusScope
.of(
context)
.requestFocus(
focusNodeA);
print(FocusScope.of(context).focusedChild.toString());
});
_enabled = true;
});

Answer 2

Please try
setState(() {
enableEditText = true;
Future.delayed(const Duration(milliseconds: 500), () {
tfController.selection =
TextSelection.fromPosition(TextPosition(offset: tfController.text.length));
FocusScope.of(context).requestFocus(focusNode);
});
});
TextField(
controller: tfController,
decoration: null,
textInputAction: TextInputAction.done,
enabled: enableEditText,
focusNode: focusNode,
),