Background Location Tracker Plugin For iOS
If you need your iOS Unity game to track the users location in the real world while the game is running in the background or the screen is off, this is the plugin you are looking for.
by This Reality
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The background location tracker plugin will send an iOS notification and starts to track the users location when the Unity game is either unfocused ("minimized") or the screen of the iOS device is turned off.
When the game is focused again, or the notification is clicked the plugin will provide Unity with a list of users locations collected in the background in coordinate system units.