하고 싶은 일

구현

main.dart

import 'package:flutter/material.dart';
import 'dart:async';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: MyHomePage(),
    );
  }
}

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

class _ClockState extends State<MyHomePage> {
  String _time = '';
  @override
  void initState() {
    Timer.periodic(
      Duration(microseconds: 1000), // 1000000で1秒
      _onTimer,
    );
    super.initState();
  }

  void _onTimer(Timer timer) {
    setState(() => _time = DateTime.now().toString());
  }

  @override
  Widget build(BuildContext context) {
    return Text(
      _time,
      style: TextStyle(
          fontSize: 50.0,
          color: Colors.yellow,
          backgroundColor: Colors.blue
      ),
    );
  }
}

화면