The idea is to track iOS Lock Screen going on and off. This functionality should work even if application goes to background. The trick below is used to keep it always alive. Just like Moment app works.
A couple months ago, I found a way to get the location update from iOS 7 and 8 even when the app is not active on foreground and not in the background. Yes, you may get the GPS coordinates from the iOS devices even when the app is killed/terminated either by the user or the iOS itself.
Here are the steps to use this solution:-
1. Download the project from Git Hub.
2. Change to your own Bundle Identifier (If need to)
3. Connect your iPhone with your mac.
4. Launch the app into your iPhone.
5. Killed the app. (Double tap and remove the app from the App Preview)
6. Travel around with your iPhone for a few days.
7. Download iFunBox for Mac or any alternative that allows you to open the app and Read the PList
under the "Documents" folder.
8. From the PLIst, you will see something like the screen shot below:-
When you see the key “UIApplicationLaunchOptionsLocationKey” under “Resume“, it means that the iOS has relaunched the app after the devices has moving significantly from the last known location. If you create a new location Manager instance, you will get new location from delegate method “didUpdateLocations“.
For the detail information, Please read: [Getting Location Updates for iOS 7 and 8 when the App is Killed/Terminated/Suspended] (http://mobileoop.com/getting-location-updates-for-ios-7-and-8-when-the-app-is-killedterminatedsuspended "Getting Location Updates for iOS 7 and 8 when the App is Killed/Terminated/Suspended").
I have used a lot of my personal time in experimenting/learning the Core Location APIs and share the solution for FREE. If my article and solution on Github helps you, please consider to donate. Donation will motivate myself to work harder in sharing more and helping more people. You may find the donation box on my website: http://mobileoop.com/
Thanks. Ricky