ios - Background fetch stops working after about 10 to 14 hours -


my application uses backgroud fetch send , upload small portion of data every 30 minutes. service working correctly 10 - 14 hours after application minimized working in foregroud - application correctly sending , receiving data every 30 minutes.

does know happens service after couple of hours? ios system automatically terminate application , therefore background fetch stops working?

can explain?

ios provides 30 seconds time frame in order app woken up, fetch new data, update interface , go sleep again. duty make sure performed tasks manage finished within these 30 seconds, otherwise system stop them.

maybe internet slow app took more 30 seconds & system stopped application.

-(void)application:(uiapplication *)application performfetchwithcompletionhandler:(void (^)(uibackgroundfetchresult))completionhandler{      nsdate *fetchstart = [nsdate date];    // make process here      [viewcontroller fetchnewdatawithcompletionhandler:^(uibackgroundfetchresult result) {         completionhandler(result);          nsdate *fetchend = [nsdate date];         nstimeinterval timeelapsed = [fetchend timeintervalsincedate:fetchstart];         nslog(@"background fetch duration: %f seconds", timeelapsed);      }]; }

also apple provides algorithm defines how background fetch should trigger, based on own usage of app. if use lot, fetch possible, if use @ 4pm every day, background fetch should trigger before, data updated when launch it.


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