Hide keyboard in TextFormField

main.dart

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',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.red,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Hide keyboard in TextFormField'),
      ),
      body: Form(
        child: Column(
          children: [
            TextFormField(),
            TextButton(
              onPressed: () => FocusScope.of(context).unfocus(),
              child: Text('Hide keyboard'),
            )
          ],
        ),
      ),
    );
  }
}