iOS Question Detecting Twist

Not sure which movement you are talking about but you can check the acceleration values: https://www.b4x.com/android/forum/t...cceleration-with-motion-object.49305/#content

B4A example from 2011 where I captured the values and analyzed them with Excel: https://www.b4x.com/android/forum/threads/android-shake-event-with-phonesensors.9857/#content
You might find a pattern that is simple enough to track.

The movement I was referring to is something like this:
You hold the phone in your hand vertically with the screen facing you, and then you rotate your hand clockwise and back.

I actually used the roll value from the first link you provided, and with a little bit of logic added, I can easily detect the condition I am looking for.

Thanks a lot,
iCAB