如何在后台保持 iOS 应用程序存活超过 10 分钟？

Question

I found this tutorial https://www.raywenderlich.com/5247-core-location-tutorial-for-ios-tracking-visited-locations (you can download the sample project and play with it.) which will track you by giving you long/lat, even if the app is closed or backgrounded, it will continue to give you the lat/long. However, if the app is backgrounded, and I leave the phone alone for about 10 minutes, the app seems to go into some kind of "suspend" state, in which when I pick it up again, the app no longer track you (no lat/long) until you bring the app to the foreground(you can now see the UI), then it will resume tracking. But I want this app to continue tracking, while in the background indefinitely. I don't want it to go into a suspend mode.

For testing purposes, I made the code:

   locationManager.distanceFilter = 3 // give me lat/long every 3 meters

I tried a lot of things to get this to work, for example, I created a recursive function that will run indefinitely, just to keep the app alive. But it did not work

Answer 1

When application enters the "Background" state - you code still running, but after several minutes app move to "Suspended" state and system can kill application for free memory, in this state you code doesn't work