How to receive data from the server when the application is not minimized, but closed?

Question

Objective-C

Hello! I don't know how to solve this problem. How to receive data from the server when the application is not minimized, but closed? (on the server, work with apns, Apple push notifications service is not implemented)
That is, upon request to the server I receive various information, it is necessary to poll periodically.
I really need help!

Answer 1

Means it is necessary to implement apns. You should not keep the application as a service that will constantly wake up the phone and drain the battery.