【 Flutter 】Flutter を 基礎 から 学習 ( Material ComponentsとiOS-Style ) part135 Material Components

import 'package:flutter/material.dart';

void main() {
  runApp(new MaterialApp(home: new MyHomePage()));
}

class MyHomePage extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return _MyHomePageState();
  }
}

class _MyHomePageState extends State<MyHomePage> {
  bool dark = false;
  bool iconButtonToggle = false;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: dark ? ThemeData.dark() : ThemeData.light(),
      home: Scaffold(
        appBar: AppBar(
          centerTitle: true, // タイトルが中央になります。
          title: Text('sample'),
          // SliverAppBarにも同じプロパティがあります。
          // flexibleSpace: ,
        ),
        body: Center(
          child: const Text("FloatingActionButton"),
        ),
        floatingActionButton: FloatingActionButton(
          onPressed: () {},
          child: Icon(Icons.add),
          tooltip: 'floating action button',
        ),
      ),
    );
  }
}