demo2.dart

Get Package - Failed Login Flow

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

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  runApp(DemoApp());
}

class DemoApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return GetMaterialApp(
      title: 'Demo',
      initialBinding: InitialBinding(),
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: Splash(),
    );
  }
}

class InitialBinding extends Bindings {
  @override
  void dependencies() async {
    final prefs = await SharedPreferences.getInstance();
    Get.put<SharedPreferences>(prefs);
    Get.put<ProfileController>(ProfileController());
  }
}

class Splash extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold();
  }
}

class ProfileController extends RxController {
  static const profileKey = 'profileId';

  var isLoggedIn = false;
  var user = '';

  static ProfileController get to => Get.find();

  @override
  void onInit() {
    final prefs = Get.find<SharedPreferences>();
    user = prefs.getString(profileKey);
    isLoggedIn = (user != null);
  }

  @override
  void onReady() {
    checkLoggedInStatus();
    super.onReady();
  }

  void checkLoggedInStatus() {
    if (isLoggedIn) {
      Get.off(HomePage());
    } else {
      Get.off(SignupPage(), binding: SignupBinding());
    }
  }

  void signup() {
    final prefs = Get.find<SharedPreferences>();
    user = 'John Doe';
    prefs.setString(profileKey, user);
    isLoggedIn = true;
    checkLoggedInStatus();
  }

  void logout() {
    final prefs = Get.find<SharedPreferences>();
    prefs.remove(profileKey);
    isLoggedIn = false;
    checkLoggedInStatus();
  }
}

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

class SignupController extends RxController {
  void signup() {
    final profileController = Get.find<ProfileController>();
    profileController.signup();
  }
}

class SignupPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final controller = Get.find<SignupController>();
    return Scaffold(
      appBar: AppBar(
        title: Text('Signup'),
      ),
      body: Center(
        child: Column(
          children: <Widget>[
            RaisedButton(
              child: Text("Do Signup"),
              onPressed: () => controller.signup(),
            )
          ],
        ),
      ),
    );
  }
}

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Home'),
      ),
      body: Center(
        child: Column(
          children: <Widget>[
            Container(
              child: Text('Welcome ' + ProfileController.to.user),
            ),
            RaisedButton(
              child: Text("Logout"),
              onPressed: () => ProfileController.to.logout(),
            )
          ],
        ),
      ),
    );
  }
}

Only difference with first demo is

  void checkLoggedInStatus() {
    if (isLoggedIn) {
      Get.off(HomePage());
    } else {
      Get.off(SignupPage(), binding: SignupBinding());
    }
  }

This would force to remove all underlying pages and make that the main page. So Splash -> SignupPage (should remove Splash) -> HomePage (should remove SignupPage).

But this fails:

flutter: [GET] GetMaterialController has been initialized
flutter: [GOING TO ROUTE] /
flutter: [GET] ProfileController has been initialized
flutter: [GET] SignupController has been initialized
flutter: [REPLACE ROUTE] /
flutter: [NEW ROUTE] /signuppage
flutter: [GET] SharedPreferences deleted from memory
flutter: [GET] onClose of ProfileController called
flutter: [GET] ProfileController deleted from memory
flutter: [GET] onClose of SignupController called
flutter: [GET] SignupController deleted from memory

════════ Exception caught by widgets library ═══════════════════════════════════
The following message was thrown building SignupPage(dirty):
 SignupController not found. You need call put<SignupController>(SignupController()) before