import 'package:flutter/material.dart';
import 'package:getx/getx.dart';
import 'package:getx/key.dart';

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

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  Widget build(BuildContext context) {
    return MaterialApp //<=== MaterialApp
      (
      navigatorKey: getxNavKey, //<=== 增加用于路由的key
      home: Scaffold(
        body: Text("你的app"),
      ),
    );
  }
}

class MyState {
  String datetime = "";
}

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

class MyPage extends StatelessWidget {
  const MyPage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final MyLogic logic = MyLogic().put(); //<===添加并且获取logic
    return Scaffold(
      body: Column(
        children: [
          logic.builder( //<=== 局部刷新的builder
            builder: () => Text("now:${logic.state.datetime}"), //<=== state中的状态数据
          ),
          ElevatedButton(
            onPressed: logic.onPressed, //<=== logic中的点击事件
            child: const Text("NOW"),
          ),
        ],
      ),
    );
  }
}

import 'package:getx/logic.dart';
import 'state.dart';

class MyLogic extends Logic<MyLogic> {
  final MyState state = MyState(); //<=== 状态数据

  void onPressed() {
    //修改状态数据
    state.datetime = DateTime.now().toString();
    //更新页面
    update();
  }

  @override
  MyLogic put() => putLogic(this); //<=== 添加到getx的管理中
}