ios - Call a method with delay of 15 sec irrespective of app state -


i need call method in every 15 seconds irrespective of fact, whether on view controller in foreground, whether in background or killed, need call @ times.

i know can delay task using nstimer

nstimer* mytimer = [nstimer scheduledtimerwithtimeinterval: 15.0 target: self                                selector: @selector(callafterfifteenseconds:) userinfo: nil repeats: yes];

but, wanted know implement fulfil condition. guess can use in app delegate need guidance implement correctly.

calling in app delegate class right place not work following cases.

  • it not work if app killed ground.
  • it not in background mode continuously. os stop process after period of time.

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