Flutter动态更新日期和时间

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

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

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String _currentDateTime = '';

  @override
  void initState() {
    super.initState();
    // 初始化时获取当前日期和时间
    _updateDateTime();
    // 每秒更新一次日期和时间
    Timer.periodic(Duration(seconds: 1), (timer) {
      _updateDateTime();
    });
  }

  void _updateDateTime() {
    setState(() {
      _currentDateTime = DateTime.now().toString();
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Dynamic Date and Time'),
        ),
        body: Center(
          child: Text(
            _currentDateTime,
            style: TextStyle(fontSize: 24),
          ),
        ),
      ),
    );
  }
}