title: How to call a method while app is kill/terminate/suspended in swift
body: <p>I want to get the list of new events, so continuously I need to call a service while I am near by the event. then only I can send my uid and eventide by API call then backend team notify that you are near by event.
  So this service how to call while app kill/terminate/suspended because these things working while app in background.</p>