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Editorial Team
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Asked: 2026-06-14T09:08:36+00:00

I have a a few threads that needs to run constantly or be locked

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I have a a few threads that needs to run constantly or be locked at my disposal. When I lock the phone or swap applications the thread seems to halt until the application is back in focus.

I have a class Worker that is a sub class of NSThread. There is a method called start which is called by the firstViewController that creates the Worker object. 

//method start
[self performSelectorInBackground:@selector(run) withObject:self];

What do I need to do to make my thread run all the time, rather than only running while in focus?

Thanks 🙂

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1 Answer

  1. Editorial Team

    When your app enters the background, all threads as suspended – unless you’ve configured your application to use multi-tasking, and your work is being done using the multi-tasking methods. This is detailed at Apple developer.

    In short, you basically can’t have a thread running constantly in the background on iOS if you want to be accepted in the App store, unless you’re a navigation or VOIP application. You can have a thread continue to run for around 10 minutes after you enter the background, but that’s it.

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