iOS 13 Schedule iOS background tasks

Question

I am implementing BackgroundTasks Framework for updating the data. But I got the below issue

Could not schedule refreshApp: Error Domain=BGTaskSchedulerErrorDomain Code=1 "(null)"
Could not schedule data featch: Error Domain=BGTaskSchedulerErrorDomain Code=1 "(null)"
2019-10-01 19:19:32.550320+0530 SOBackgroundTask[34131:1129470] Can't end BackgroundTask: no background task exists with identifier 3 (0x3), or it may have already been ended. Break in UIApplicationEndBackgroundTaskError() to debug.

score 42 · Answer 1 · answered Oct 03 '19 at 17:19

Here are possible error codes for Domain=BGTaskSchedulerErrorDomain extracted from ObjC headers with some explanation.

BGTaskSchedulerErrorCodeUnavailable = 1 // Background task scheduling functionality is not available for this app/extension. Background App Refresh may have been disabled in Settings.

BGTaskSchedulerErrorCodeTooManyPendingTaskRequests = 2 // The task request could not be submitted because there are too many pending task requests of this type. Cancel some existing task requests before trying again.

BGTaskSchedulerErrorCodeNotPermitted = 3 // The task request could not be submitted because the appropriate background mode is not included in the UIBackgroundModes array, or its identifier was not present in the BGTaskSchedulerPermittedIdentifiers array in the app's Info.plist.

https://developer.apple.com/documentation/backgroundtasks/bgtaskschedulererrorcode?language=objc — Antenehs, Jan 01 '21 at 02:56

Gurjinder Singh · Accepted Answer · 2021-01-02T13:47:16.193

40

The solution is to run on a device. I was running on a simulator. However, It was showing the Background App Refresh has been enabled in Settings while running on the simulator.

There may be some other reasons. Please visit https://developer.apple.com/documentation/backgroundtasks/bgtaskschedulererrorcode/bgtaskschedulererrorcodeunavailable?language=objc

edited Jan 02 '21 at 13:47

answered Oct 23 '19 at 16:43

Gurjinder Singh

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score 8 · Answer 3 · edited May 08 '20 at 01:03

8

For:

BGTaskSchedulerErrorDomain error 3

Check inside the project’s .xcodeproj file for the appropriate target. Then go to the info tab and Custom iOS Target Properties and check that the permitted background task scheduler identifiers (BGTaskSchedulerPermittedIdentifiers) are added.

This solved my problem when adding BackgroundTasks to an existing project.

edited May 08 '20 at 01:03

Jeremy Caney

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answered Apr 28 '20 at 13:03

eric.rl

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Just want to add that for it to work best you should use the "com.COMPANY.IDNAME" format for your identifiers – Some guy May 18 '23 at 22:04

score 4 · Answer 4 · answered Mar 19 '20 at 05:46

4

Please check if you miss registering BGTaskSchedulerPermittedIdentifiers in info.plist file of your project.

answered Mar 19 '20 at 05:46

iCoder86

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score 2 · Answer 5 · answered Nov 11 '19 at 09:07

2

I have tested on real device(iOS13.2, and iOS13.2.2), but it's same result.

Error Domain=BGTaskSchedulerErrorDomain Code=2 "(null)" Can't end BackgroundTask: no background task exists with identifier 37 (0x25), or it may have already been ended. Break in UIApplicationEndBackgroundTaskError() to debug.

Error Domain=BGTaskSchedulerErrorDomain Code=1 "(null)" Can't end BackgroundTask: no background task exists with identifier 113 (0x71), or it may have already been ended. Break in UIApplicationEndBackgroundTaskError() to debug.

It seems that there is still exist bug.

https://forums.developer.apple.com/thread/121990

answered Nov 11 '19 at 09:07

James Chan

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When I run debug command schedule is successful but I get the same error (Code 1) on real device when its scheduling a task. (iOS 13.2.3) – Luke Nov 20 '19 at 08:43
@Teo what did you mean? succeeded on simulator? and failed on real device? – jackiszhp Mar 24 '20 at 02:19
This has been fixed in iOS 13.4 GM. – James Chan Aug 21 '20 at 09:55

score 2 · Answer 6 · answered Jul 17 '20 at 03:21

2

I think this is because that your mobile turn the bg refresh off!!!!!!!

answered Jul 17 '20 at 03:21

Lyman Lai

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man you made my day even though I was searching for another question. Thanks a lot! – user3524337 Jul 21 '21 at 17:15
how to turn on bg refresh off , iPhone? – Shihab Uddin Dec 06 '22 at 09:42

score 1 · Answer 7 · answered Sep 30 '21 at 01:41

1

In case of BGTaskSchedulerErrorDomain error 3, I didn't add below

<array>
    <string>com.shiny.job</string>
    <string>com.shiny.jobpower</string>
    <string>com.shiny.jobnet</string>
    <string>com.shiny.jobpowernet</string>
</array>```

answered Sep 30 '21 at 01:41

Div

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Didn't add them to where? – Pat Long - Munkii Yebee Jan 20 '22 at 15:40

score 0 · Answer 8 · answered Jun 13 '20 at 09:28

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Just check the Background Modes has been added to the target Capabilities and that Background fetch and Background processing options are selected

answered Jun 13 '20 at 09:28

Miniapps

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score 0 · Answer 9 · answered Jan 01 '21 at 02:58

According to https://developer.apple.com/documentation/backgroundtasks/bgtaskschedulererrorcode/bgtaskschedulererrorcodeunavailable?language=objc, this error usually occurs for one of three reasons:

The user has disabled background refresh in settings.
The app is running on Simulator which doesn’t support background processing.
The keyboard extension either hasn’t set RequestsOpenAccess to YES in The Info.plist File, or the user hasn’t granted open access.
The extension type isn’t able to schedule background tasks.

score 0 · Answer 10 · answered Feb 20 '23 at 16:43

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check you Appdelegate.swift is including WorkmanagerPlugin.registerTask(withIdentifier: "your.task.id")

answered Feb 20 '23 at 16:43

Eray Hamurlu

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iOS 13 Schedule iOS background tasks

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