How to create a background function that is called every n minutes indefinately

Question

This question exists in different flavors on github, but this mine is specific. I'm creating an iPhone app that logs locations. I'm trying to log the location every 5 min even when the app is in the background and when the user is not moving. So far I've tried the following;

Use CoreLocation to fire the events - if the phone is stationary, the location events are not fired, so logging every 4 min in the bg does not work.

Use Perform Fetch to and read last location - this seems to fire when it pleases, can't get it to reliably fire every 5 min

Use a background task and NS Timer havent tried but seems feasable ** since this won't be going in the app store, is there a way to call a bgtask that spins up another bg task before it dies?

**** this app does not need to be approved by apple

Answer 1

If you need to do this for an in-house app - you're saying the app doesn't need to be approved by Apple - then you can set your app to be a VOIP app. In your info.plist file you set the corresponding background mode and then you can call the UIApplication:setKeepAliveTimeout to tell iOS at what interval you want some background processing time. Minimum interval is 10 minutes.