Untitled

import 'package:flutter/material.dart';

void main() {
  runApp(const MainApp());
}

class MainApp extends StatefulWidget {
  const MainApp({super.key});

  @override
  State<MainApp> createState() => _MainAppState();
}

class _MainAppState extends State<MainApp> {
  TextEditingController inputController = TextEditingController();
  String inputText = '';

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        home: Scaffold(
      body: Column(mainAxisAlignment: MainAxisAlignment.center, children: [
        Text(inputText),
        Padding(
          padding: const EdgeInsets.symmetric(horizontal: 40),
          child: TextField(
            controller: inputController,
            decoration: const InputDecoration(
              border: OutlineInputBorder(),
              labelText: 'Escribe algo',
            ),
          ),
        ),
        ElevatedButton(
            onPressed: () {
              setState(() {
                inputText = inputController.text;
              });
            },
            child: const Text('Mostrar'))
      ]),
    ));
  }
}