MissingPluginException - Problem with several plugins on iOS only.

[Christer-Muntean]

I have issues on iOS with this simple code sample, it throws an MissingPluginException. On Android everything works perfectly fine.

flutter_isolate: ^2.0.2

void connect(String args) async {
  SpotifySdk.subscribeConnectionStatus().listen((event) {
    print(event);
    SpotifySdk.subscribePlayerState().listen((playerStreamData) {
      print('track name: ${playerStreamData.track?.name}');
    });
  });
  SpotifySdk.connectToSpotifyRemote(
    clientId: 'xxxxxx',
    redirectUrl: 'spotify-ios-quick-start://spotify-login-callback',
  );
}

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await FlutterIsolate.spawn(connect, '');

Error spotify_sdk:

======= Exception caught by services library ======================================================
The following MissingPluginException was thrown while activating platform stream on channel player_state_subscription:
MissingPluginException(No implementation found for method listen on channel player_state_subscription)

When the exception was thrown, this was the stack: 
#0      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:175:7)
<asynchronous suspension>
#1      EventChannel.receiveBroadcastStream.<anonymous closure> (package:flutter/src/services/platform_channel.dart:516:9)
<asynchronous suspension>
====================================================================================================

Also having problem with shared_preferences:
[VERBOSE-2:ui_dart_state.cc(209)] Unhandled Exception: MissingPluginException(No implementation found for method getAll on channel plugins.flutter.io/shared_preferences)

[DennisMuchiri]

@Christer-Muntean did you resolve the shared preferences issue?

[DennisMuchiri]

@Christer-Muntean
After much trials I discovered you have to re-initialize the shared preferences plugin after entering isolate
Using these two plugins; add to pubspec.yaml

shared_preferences_ios: shared_preferences_android:

In your isolate function

if (Platform.isAndroid) { SharedPreferencesAndroid.registerWith(); } else if (Platform.isIOS) { SharedPreferencesIOS.registerWith(); }

[nmfisher]

Unfortunately due to the way that flutter_isolate creates new isolates (by creating a new FlutterEngine), many plugins will have incompatibilities that have to be addressed on the plugin side (or at least with workarounds like the one @DennisMuchiri posted). There's not much that can be done on the flutter_isolate side and this is unlikely to change in the near future.

@Christer-Muntean does reinitializing fix your issue?