Flutter:将当前日期与从api收到的日期进行比较

import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';

class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  DateTime currentDate;
  DateTime apiDate;

  @override
  void initState() {
    super.initState();
    fetchApiDate();
    currentDate = DateTime.now();
  }

  Future<void> fetchApiDate() async {
    final response = await http.get('API_URL');
    if (response.statusCode == 200) {
      final data = jsonDecode(response.body);
      setState(() {
        apiDate = DateTime.parse(data['date']);
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Date Comparison'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'Current Date: $currentDate',
            ),
            SizedBox(height: 20),
            Text(
              'API Date: ${apiDate ?? 'Loading...'}',
            ),
            SizedBox(height: 20),
            if (apiDate != null)
              Text(
                'Comparison Result: ${currentDate.compareTo(apiDate)}',
              ),
          ],
        ),
      ),
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: MyWidget(),
  ));
}