gistfile1.txt

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.green,
      ),
      home: new page(),
    );
  }
}

class page extends StatefulWidget {
  @override
  _pageState createState() => new _pageState();
}

class _pageState extends State<page> {
  



  @override
  Widget build(BuildContext context) {
    var d=5;
    var textEditingControllers = <TextEditingController>[];
    var textFields = <TextField>[];
    var list = new List<int>.generate(d, (i) =>i + 1 );
    list.forEach((i) {
      var textEditingController = new TextEditingController(text: "test $i");
      textEditingControllers.add(textEditingController);
      return textFields.add(new TextField(controller: textEditingController));
    });

    return new Scaffold(
      appBar: new AppBar(),
      body: new Column(
      children: textFields),
      floatingActionButton: new FloatingActionButton(
        onPressed: (){
          textEditingControllers[1].clear();     
        } ,
      ),
    );
  }
}

createTexttextfields (int d){
    var textEditingControllers = <TextEditingController>[];
  
    var textFields = <TextField>[];
    var list = new List<int>.generate(d, (i) =>i + 1 );
    print(list);

    list.forEach((i) {
      var textEditingController = new TextEditingController(text: "test $i");
      textEditingControllers.add(textEditingController);
      return textFields.add(new TextField(controller: textEditingController));
    });
    return textFields;
}