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

void main() {
  Get.lazyPut(() => Page2Controller(), fenix: true);
  runApp(GetMaterialApp(home: HomePage()));
}

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('HOME')),
      body: Center(
        child: RaisedButton(
          child: Text('Go to page 2'),
          onPressed: () => Get.to(() => Page2()),
        ),
      ),
    );
  }
}

class Page2 extends StatelessWidget {
  final controller = Get.find<Page2Controller>();
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Page2')),
      body: Center(
        child: Obx(() => Text(controller.number.toString())),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () => controller.increment(),
        child: Icon(Icons.add),
      ),
    );
  }
}

class Page2Controller extends GetxController {
  RxInt number = RxInt(0);

  increment() => number++;
}