Get Instance of controller attached to a TextField in a loop - flutter

Question

I am trying to create a page with more than one TextField widgets in flutter. Number of textfields to display are determined at runtime. while creating those textfields a controller from the controller array is attached to each textfield.
Everything is working as expected. but doen't matter which textfield i click, i always get the callback of all the textfields in a single onChanged function.
Therefore, i am not able to detect that value of which textfield is changed.
Please refer to code for more insight.
In-Short, i just want to know how to get the instance of textfield controller which is currently active.
Could somebody please let me know what i am doing wrong.
Thanks
List<TextEditingController> _controllers = <TextEditingController>[];
int controllersAttached = -1;
#override
Widget build(BuildContext context) {
controllersAttached += 1;
for (int i = 0;i < fibProvider.quesTextList.length;i++) ...<dynamic>[
TextField(
autofocus: false,
cursorColor: const Color(0xFFD8D8D8),
maxLines: 1,
textAlign: TextAlign.center,
controller: _controllers[controllersAttached %fibProvider.numberOfBlanks],
onChanged: (String data) {
// here i can distinguish between the controllers depending upon the text
entered in them. but if there are 3 textfields and the same data is
entered in all the three then this code only returns the first
controller with the matched value.
final int index = _controllers.indexWhere(TextEditingController item) {
return data.compareTo(
item.text.toString()) == 0;
});
},
),
]
}

Answer 1

You can just pass i variable to onChanged callback inside collection-for:
class _MyHomePageState extends State<MyHomePage> {
final int _fields = 10;
List<TextEditingController> controllers;
#override
void initState() {
super.initState();
controllers = List.generate(_fields, (i) => TextEditingController());
}
#override
void dispose() {
controllers.forEach((c) => c.dispose());
super.dispose();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title)
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
for (int i = 0; i < _fields; i++)
TextField(
controller: controllers[i],
onChanged: (value) {
final controller = controllers[i];
print('Current field index is $i and new value is $value');
},
),
],
),
)
);
}
}