Getx Issue 1481 (same Type Controllers in multipage navigation).

issue1481.dart

/// Note:
/// A simple fix for this case scenario of local controller lifecycle, might be 
/// to separate the `global:false` logic here: 
/// https://github.com/jonataslaw/getx/blob/07ad5d7f9e726f181800359d0218b44e5967ccf8/lib/get_state_manager/src/simple/get_state.dart#L177

// ...
//    if (_isCreator! || widget.assignId) {
//      if (widget.autoRemove) {
//        /// if the Controller is flagged as "local", run manually `onClose()`.
//        if( !widget.global ){
//          controller?.onClose();
//        } else if(GetInstance().isRegistered<T>(tag: widget.tag)){
//          GetInstance().delete<T>(tag: widget.tag);
//        }
//      }
//    } 
// ...

/// The 2 samples here are forcing a unique Controller instance per Route, even if the View and Controller
/// are the same Type. Both approaches uses `GetBuilder()` as a Stateful initializer to manage our Controller lifecycle.
/// Sample 1 uses global registration with tag, Sample 2 uses a local controller (not accesible via Get.find()).

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

void main() {
    runApp(MaterialApp(home: HomeView(), navigatorKey: Get.key));
}

/// Sample 1 (global controller with tags)

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

  @override
  Widget build(BuildContext context) {
    /// option 1 - Global instance with tag.
    final _controller = _Controller();
    return GetBuilder<_Controller>(
      init: _controller,
      tag: _controller.tag,
      autoRemove: true,
      builder: (_) => _HomeInternal(controller: _controller),
    );
  }

/// Sample 2 (local controller)
//
// class HomeView extends StatelessWidget {
//   const HomeView({Key? key}) : super(key: key);
//
//   @override
//   Widget build(BuildContext context) {
//     return GetBuilder<_Controller>(
//       init: _Controller(),
//       global: false,
//       dispose: (state) => state.controller?.onClose(),
//       builder: (controller) => _HomeInternal(controller: controller),
//     );
//   }
// }



class _HomeInternal extends StatelessWidget {
  final _Controller controller;

  const _HomeInternal({Key? key, required this.controller}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text(controller.title)),
      body: Center(
        child: TextButton(onPressed: controller.nextPage, child: Text("Next")),
      ),
    );
  }
}

class _Controller extends GetxController {
  static int _instanceCount = 0;
  final int _id = ++_instanceCount;

  late String tag;

  _Controller() {
    tag = 'tag$_id';
  }

  String get title => 'Home #$_id';

  @override
  void onReady() {
    print('onready $title');
  }

  @override
  void onClose() {
    print('onclose $title');
  }

  void nextPage() {
    Get.to(() => HomeView());
  }
}

Sample 2
If I don't use GetBuilder, "onClose" method will never be called.
May I ask what is the reason

class HomeInternal extends StatelessWidget {
  // const HomeInternal({Key? key, required this.controller}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final _Controller controller = _Controller();
    return Scaffold(
      appBar: AppBar(title: Text(controller.title)),
      body: Center(
        child: TextButton(onPressed: controller.nextPage, child: Text("Next")),
      ),
    );
  }
}

class _Controller extends GetxController {
  static int _instanceCount = 0;
  final int _id = ++_instanceCount;

  late String tag;

  _Controller() {
    tag = 'tag$_id';
  }

  String get title => 'Home #$_id';

  @override
  void onReady() {
    print('onready $title');
  }

  @override
  void onClose() {
    print('onclose $title');
  }

  void nextPage() {
    Get.to(() => YZTestGetXPage());
  }
}