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Editorial Team
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Asked: 2026-06-14T13:55:37+00:00

I am trying to figure out how to use a background thread to execute

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I am trying to figure out how to use a background thread to execute a command ever 4hrs.

I have never created anything like this before so have only been reading about it so far.. One of the things I have read are this

“Threads tie up physical memory and critical system resources”

So in that case would it be a bad idead to have this thread that checkes the time then executes my method… or is there a better option, I have read about GCD (Grand Central Dispatch) but I am not sure if this is applicable as I think its more for concurrent requests? not something that repeats over and over again checking the time..

Or finally is there something I have completely missed where you can execute a request every 4hrs?

Any help would be greatly appreciated.

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1 Answer

  1. Editorial Team

    There is a max time background processes are allowed to run (10 min) which would make your approach difficult. Your next best attempt is to calculate the next event as save the times tamp somewhere. Then if the app is executed at or after that event it can carry out whatever action you want.

    This might help:
    http://www.audacious-software.com/2011/01/ios-background-processing-limits/

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