Flutter AudioService plugin not working on Ios release - flutter

Question

I'm using AudioService plugin and it works fine on Android and in debug mode in iOS. But once I test it on a real iOS device (in release mode) It's giving me exceptions
first at all
void quranStartListeningPoint() => AudioServiceBackground.run(() => QuranAudioService());
second this is my play Function
void startListeningToAyah({model.Ayah ayah, model.Surah surah}) {
if (AudioService.running) {
await AudioService.stop();
await Future.delayed(Duration(seconds: 1));
}
await AudioService.start(
androidNotificationColor: 0XFFB590EE,
backgroundTaskEntrypoint: quranStartListeningPoint,
params: {
'sheikhId': "$selectedReciter",
"ayahIndex": ayah.numberInSurah,
"surah": surah.number,
"quranModel": _quranDao.quranModelAsJson
},
);
}
Next I convert quranModelAsJson from a json to a model because I need the whole model in the Service Class and this is the only way to send it (as I think)
class QuranAudioService extends BackgroundAudioTask {
final _audioPlayer = AudioPlayer();
final String baseUrl = "https://cdn.alquran.cloud/media/audio/ayah/";
String ayahUrl;
int surahNumber;
int ayahIndex;
int renewSurah = 0;
QuranModel model;
Surah surah;
String sheikhId;
#override
Future<void> onStart(Map<String, dynamic> params) async {
await _audioPlayer.setReleaseMode(ReleaseMode.STOP);
implementParams(params);
onCompleteListener();
AudioServiceBackground.setState(
systemActions: [MediaAction.seekTo],
controls: getPlayControllers(),
playing: true,
processingState: AudioProcessingState.connecting);
ayahUrl = "$baseUrl$sheikhId/${surah.ayahs[ayahIndex].number}";
await _audioPlayer.play("$ayahUrl");
setMediaItem();
AudioServiceBackground.setState(
controls: getPlayControllers(),
playing: true,
processingState: AudioProcessingState.ready,
systemActions: [MediaAction.seekTo],
);
}
void setMediaItem() {
AudioServiceBackground.setMediaItem(
MediaItem(
extras: {"surahIndex": surahNumber, "renewSurah": renewSurah},
id: "$ayahIndex",
album: "${surah.englishName}",
title: "${surah.name}",
),
);
}
#override
Future<void> onPause() async {
// Broadcast that we're paused, and what controls are available.
AudioServiceBackground.setState(
controls: getPauseControllers(),
systemActions: [MediaAction.seekTo],
playing: false,
processingState: AudioProcessingState.ready);
// Pause the audio.
_audioPlayer.pause();
}
#override
Future<void> onStop() async {
_audioPlayer.stop();
if (ayahIndex == surah.ayahs.length) {
await AudioServiceBackground.setState(
controls: [replayControl],
playing: false,
processingState: AudioProcessingState.stopped);
} else {
await AudioServiceBackground.setState(
controls: [],
playing: false,
processingState: AudioProcessingState.stopped);
return super.onStop();
}
}
#override
Future<void> onPlay() async {
setMediaItem();
AudioServiceBackground.setState(
controls: getPlayControllers(),
playing: true,
processingState: AudioProcessingState.ready,
systemActions: [MediaAction.seekTo],
);
await _audioPlayer.play(ayahUrl);
renewSurah = 0;
}
#override
Future<void> onSkipToNext() async {
playNext();
}
#override
Future<void> onSkipToPrevious() async {
playPrevious();
}
// #override
// void onRewind() {
// ayahIndex = 0;
// ayahUrl = "$baseUrl$sheikhId/${surah.ayahs[ayahIndex].number}";
// this.onPlay();
// }
void implementParams(Map<String, dynamic> params) {
surahNumber = params["surah"] - 1;
ayahIndex = params["ayahIndex"] - 1;
sheikhId = params["sheikhId"];
if (model == null) model = QuranModel.fromJson(params["quranModel"]);
surah = model.surahs[surahNumber];
}
void onCompleteListener() {
_audioPlayer.onPlayerCompletion.listen((event) {
playNext();
});
}
void playNext() async {
ayahIndex++;
if (ayahIndex < surah.ayahs.length) {
ayahUrl = "$baseUrl$sheikhId/${surah.ayahs[ayahIndex].number}";
this.onPlay();
} else
changeNextSurahIndex();
}
void changeNextSurahIndex() {
renewSurah = 1;
if (surahNumber == 113) {
surahNumber = 0;
} else
surahNumber++;
ayahIndex = 0;
surah = model.surahs[surahNumber];
ayahUrl = "$baseUrl$sheikhId/${surah.ayahs[ayahIndex].number}";
this.onPlay();
}
void changePreviousSurahIndex() {
if (surahNumber == 0) {
surahNumber = 113;
} else
surahNumber--;
ayahIndex = 0;
renewSurah = 1;
surah = model.surahs[surahNumber];
ayahUrl = "$baseUrl$sheikhId/${surah.ayahs[ayahIndex].number}";
this.onPlay();
}
void playPrevious() async {
if (ayahIndex > 0) {
ayahIndex--;
ayahUrl = "$baseUrl$sheikhId/${surah.ayahs[ayahIndex].number}";
this.onPlay();
} else {
changePreviousSurahIndex();
}
}
List<MediaControl> getPlayControllers() {
return [
skipToNextControl,
pauseControl,
skipToPreviousControl,
stopControl
];
}
List<MediaControl> getPauseControllers() {
return [skipToNextControl, playControl, skipToPreviousControl, stopControl];
}
}
It was always giving me that ayahs was called on null
which means my json didnt converted to the model
so I deleted this implementation and added just a url to play
and the exception was
2020-08-31 17:58:08.458205-0400 Runner[700:75506] iOS => call startHeadlessService, playerId bb98efb6-a819-4ea7-a566-1dc6f0ff3df4
2020-08-31 17:58:08.471709-0400 Runner[700:76237] [VERBOSE-2:ui_dart_state.cc(166)] Unhandled Exception: NoSuchMethodError: The method '*' was called on null.
Receiver: null
Tried calling: *()
#0 AudioServiceBackground.run (package:audio_service/audio_service.dart:144)
<asynchronous suspension>