Apple says: You should only create a single instance of CMMotionManager to get accurate data.
What if I want to start the device motion updates when the app starts and then take the updatesToQueue at multiple places.
Scenario is something like this:
App starts - Start device motion updates without handler
ClassA - Start device motion updates to queue at a particular time.
ClassB - Start device motion updates to queue at a particular time.
Stop device motion updates when required.
via Chebli Mohamed
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