Flutter and GetxController - How to manage state unreliability?

user_8799548 0
Viewed 11891

I currently have many problems in my app with the get package for Flutter (https://pub.dev/packages/get) and the following state scenario:

For example I have a GetxController UserController. I need this controller in different Widgets, so I initialize it with Get.put() in the first widget and for the other child widgets I'll call it with Get.find(). That works.

But: I have some widgets that sometimes load before the controller got initialized and sometimes after. So I get many "UsersController" not found errors. Maybe there exists some workaround for this problem?

flutter-getx flutter
5 Answers

You could initialize your UsersController class using a Bindings class, prior to the start of your app.

Example

class UsersController extends GetxController {
  static UsersController get i => Get.find();
  int userId = 5;
}

class UsersBinding extends Bindings {
  @override
  void dependencies() {
    Get.put<UsersController>(UsersController());
  }
}

void main() async {
  UsersBinding().dependencies();
  runApp(MyApp());
}

Done this way your UsersController is guaranteed to be available everywhere in your app, prior to any Widgets loading.

class MyHomePage extends StatelessWidget {
  final UsersController uc = Get.find();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('GetX Bindings'),
      ),
      body: Center(
        child: Obx(() => Text('userId: ${uc.userId}')),
      ),
    );
  }
}
user_23012240

try to add

GetMaterialApp(
  smartManagement: SmartManagement.keepFactory,
)

so that it can store factory of those instanse

or make sure add permanent

Get.put<Repo>(Repo(), permanent: true);

so that it never get deleted from memory

user_99360440

if u need to check class is initialized, u most keep the class in memory with permanent:trueand set tag:'anything you want for check this object' property in Get.put function, and now u can check

bool Get.isRegistered<className>(tag: 'TagInPut')
user_101495350

If there's no specific reason, you can just call Get.put(UserController()) at main function and wrap material app with GetMaterialApp.

user_138810520

if you are using get to provide an instance of something across your app meaby https://pub.dev/packages/get_it could help you more. just be sure that you use allowReassignment==true so you can update your instance if you want save a full new controller, but if you want to use the same always get_it is perfect for you

user_87984570
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