ios - how to keep app running in background only if the location manager is runnig -

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i'm using location background mode, makes app runs forever. wanna when location manager active (user pressed start saving location) , app enter ground mode app must stay running (achieved). but, if user didn't pressed button start saving location or pressed button "stop saving locations" app can killed or suspended when in background. app running on background if has no work do. , drains battery.


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