ios – Dart Unhandled Exception: NoSuchMethodError: No top-level getter ‘xx’ declared.Couldn’t run the run important Dart entrypoint

Steps to breed

NO.1 Create the next Dart program:

(1) important.dart

import 'bundle:flutter/materials.dart';

void important() => runApp(const MyApp());

@pragma('vm:entry-point')
void take a look at() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : tremendous(key: key);

  @override
  Widget construct(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colours.blue,
      ),
      house: Scaffold(
        physique: const Middle(
          youngster: Textual content('Flutter Demo'),
        ),
      ),
    );
  }
}

(2) pubspec.yaml

model: 1.0.0+1

atmosphere:
  sdk: ">=2.16.2 <3.0.0"

dependencies:
  flutter:
    sdk: flutter

  # The next provides the Cupertino Icons font to your software.
  # Use with the CupertinoIcons class for iOS fashion icons.
  cupertino_icons: ^1.0.2
  shared_preferences: ^2.0.13

(3) flutter physician

/Customers/dqs/Paperwork/CompanyProjects/Flutter/flutter/bin/flutter physician --verbose
[✓] Flutter (Channel steady, 2.10.4, on macOS 12.0.1 21A559 darwin-x64, locale zh-Hans-CN)
    • Flutter model 2.10.4 at /Customers/dqs/Paperwork/CompanyProjects/Flutter/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision c860cba910 (4 weeks in the past), 2022-03-25 00:23:12 -0500
    • Engine revision 57d3bac3dd
    • Dart model 2.16.2
    • DevTools model 2.9.2
    • Pub obtain mirror https://pub.flutter-io.cn
    • Flutter obtain mirror https://storage.flutter-io.cn

NO.2 ~ Create the next iOS program:

(1) BaseFlutterController.swift

import UIKit
import Flutter

class BaseFlutterController: FlutterViewController {
    
    override init(engine: FlutterEngine, nibName: String?, bundle nibBundle: Bundle?) {
        tremendous.init(engine: engine, nibName: nibName, bundle: nibBundle)
    }
    
    required init(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been carried out")
    }
    
    override func viewDidLoad() {
        tremendous.viewDidLoad()

    }
    
}

(2) TestController.swift

import UIKit
import FlutterPluginRegistrant

class TestController: BaseFlutterController {
    
    init(withEntrypoint entryPoint: String?) {
      let appDelegate: AppDelegate = UIApplication.shared.delegate as! AppDelegate
      let newEngine = appDelegate.flutterEngines.makeEngine(withEntrypoint: entryPoint, libraryURI: nil)
      // register third-party packages
      GeneratedPluginRegistrant.register(with: newEngine)
      tremendous.init(engine: newEngine, nibName: nil, bundle: nil)
    }
    
    required init(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been carried out")
    }

    override func viewDidLoad() {
        tremendous.viewDidLoad()
       
    }
}

(3) AppDelegate.swift

import UIKit
import Flutter

@UIApplicationMain
class AppDelegate: FlutterAppDelegate {
    
    //MARK: Flutter Engines
    lazy var flutterEngines = FlutterEngineGroup(title: "native_flutter_engine_group", undertaking: nil)

(4) enter flutter display

let testVC = TestController(withEntrypoint: "take a look at")
navigationController?.pushViewController(testVC, animated: true)

…then run the app on an iOS system.

Anticipated conduct

Anticipate take a look at() to be run as this system’s entry-point, yielding a traditional flutter display.

Precise conduct

The app runs properly in debug mode, however fails in launch mode with the next error:

[768:219965] [VERBOSE-2:shell.cc(93)] Dart Unhandled Exception: NoSuchMethodError: No top-level getter 'take a look at' declared.
Receiver: top-level
Tried calling: take a look at, stack hint: #0      NoSuchMethodError._throwNew (dart:core-patch/errors_patch.dart:222)
[768:219965] [VERBOSE-2:dart_isolate.cc(681)] Couldn't resolve important entrypoint perform.
[VERBOSE-2:dart_isolate.cc(165)] Couldn't run the run important Dart entrypoint.
[768:219965] [VERBOSE-2:runtime_controller.cc(381)] Couldn't create root isolate.
[768:219965] [VERBOSE-2:shell.cc(580)] Couldn't launch engine with configuration.

My strive

After I eliminated the ‘shared_preferences: ^2.0.13’ bundle from the ‘pubspec.yaml’, it labored properly in each debug and launch mode.
Then I additionally tried different packages(local-storage associated and others), I discovered that after I used packages about native storage (e.g. shared_preferences、cached_network_image …), the issue confirmed up undoubtedly, and once I eliminated them, every part was okay. (All of the local- storage associated packages, just like the shared_preferences, works properly in pure Flutter undertaking in each debug and launch mode, however not labored in iOS x Flutter undertaking in launch mode.)