🐞[iOS] callbackDispatcher is not execute when using the Workmanager().registerOneOffTask

[SuryaChinnadurai1997]

I have checkout the example folder in the workmanager package and then ran the example in the iOS platform. But the callbackDispatcher is not execute when i resister registerOneOffTask. It's happens in the iphone real device

Code snippet:

https://github.com/fluttercommunity/flutter_workmanager/tree/main/example

Version

Technology	Version
Workmanager version	^0.5.1
Xcode version	14.3
Swift version	5.8
iOS deployment target	13.0

Describe the error Background task is not execute.

Output of flutter doctor -v [✓] Flutter (Channel stable, 3.10.5, on macOS 13.1 22C65 darwin-arm64, locale en-US) • Flutter version 3.10.5 on channel stable at /Users/samv/flutter • Upstream repository https://github.com/flutter/flutter.git • Framework revision 796c8ef792 (4 weeks ago), 2023-06-13 15:51:02 -0700 • Engine revision 45f6e00911 • Dart version 3.0.5 • DevTools version 2.23.1

[✓] Android toolchain - develop for Android devices (Android SDK version 32.1.0-rc1) • Android SDK at /Users/samv/Library/Android/sdk • Platform android-33, build-tools 32.1.0-rc1 • ANDROID_HOME = /Users/samv/Library/Android/sdk • ANDROID_SDK_ROOT = /Users/samv/Library/Android/sdk • Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java • Java version OpenJDK Runtime Environment (build 11.0.12+0-b1504.28-7817840) • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 14.3) • Xcode at /Applications/Xcode.app/Contents/Developer • Build 14E222b • CocoaPods version 1.12.1

[✓] Chrome - develop for the web • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2021.2) • Android Studio at /Applications/Android Studio.app/Contents • Flutter plugin can be installed from: 🔨 https://plugins.jetbrains.com/plugin/9212-flutter • Dart plugin can be installed from: 🔨 https://plugins.jetbrains.com/plugin/6351-dart • Java version OpenJDK Runtime Environment (build 11.0.12+0-b1504.28-7817840)

[✓] VS Code (version 1.80.0) • VS Code at /Applications/Visual Studio Code.app/Contents • Flutter extension version 3.68.0

[✓] Connected device (3 available) • iPhone 14 Pro (mobile) • FAC97301-5BBE-422A-BECE-BD7361EB3013 • ios • com.apple.CoreSimulator.SimRuntime.iOS-16-4 (simulator) • macOS (desktop) • macos • darwin-arm64 • macOS 13.1 22C65 darwin-arm64 • Chrome (web) • chrome • web-javascript • Google Chrome 114.0.5735.198

[✓] Network resources • All expected network resources are available.

• No issues found!

[acamue]

Any solution to this? same here and is not working on ios

[SuryaChinnadurai1997]

@acamue No. Still i didn't get any solution

[f1dz]

Mine iPhone XR, iOS 17.0.2 got this error:

[VERBOSE-2:dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(bgTaskSchedulingFailed(Error Domain=BGTaskSchedulerErrorDomain Code=1 "(null)") error, Scheduling the task using BGTaskScheduler has failed.

This may be due to too many tasks being scheduled but not run.

See the error for details: Error Domain=BGTaskSchedulerErrorDomain Code=1 "(null)"., null, null)
#0      StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:652:7)
#1      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:310:18)
<asynchronous suspension>
#2      Workmanager.registerOneOffTask (package:workmanager/src/workmanager.dart:192:7)
<asynchronous suspension>

Working well on Android

[xunreal75]

Did you test it on a real device and is Background App Refresh enabled in Settings?

[SuryaChinnadurai1997]

Did you test it on a real device and is Background App Refresh enabled in Settings?

Yes. I tested in the iPhone real device and the Background App Refresh enabled in that device.

[ranjanSoumyaDO]

callbackDispatcher() is not executing in ios. Is any one have a solution?

[scottynoshotty]

I have one off tasks working on iOS

Pull in this branch in your pubspec.yaml

  workmanager:
    git:
      url: https://github.com/absar/flutter_workmanager.git
      ref: ios-bg-tasks-enh-final

And you must set debug to true when initializing in main.dart

  Workmanager().initialize(callbackDispatcher, isInDebugMode: true);

[synstin]

@scottynoshotty Apply that package and it should work fine. Thanks.

[synstin]

@scottynoshotty Using the package you provided, callbackDispatcher is called normally, but no delay is applied. Even if you set the delay option, callbackDispatcher is called immediately. (Only on ios)

[AntonioVerdiglione1996]

hi guys, what about Workmanager().registerPeriodicTask() ? on ios still do not work? i tryied the the solution @scottynoshotty but it works only on registerOneOffTask... i need to run a periodic work, anybody have a solution?

[andersonribeir]

@AntonioVerdiglione1996 i need periodic too, can you resolve this issue?

[SuryaCinnadurai]

Can someone help how to resolve it?

[noeGnh]

+1