ANF input

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Scaffold(
        appBar: AppBar(
          title: const Text("Example ANF input"),
        ),
        body: Padding(
          padding: const EdgeInsets.all(32.0),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              TextFormField(
                decoration: const InputDecoration(
                  labelText: 'Label text',
                  border: OutlineInputBorder(),
                  suffixIcon: Icon(
                    Icons.error,
                  ),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}