I’ve just started playing with CMMotionManager on my iPhone in an OpenGL program. I allocate CMMotionaManger and startDeviceMotionUpdates in -viewDidLoad. In -update I check if deviceMotionActive and print the roll value.
motionManager.deviceMotion.attitude.roll
For the first few times it is 0.0, but after a while a new value kicks in that
seems right (e.g., 90-ish degrees or 50* or something that reflects how I am
holding my phone.
(1) Does CMMotionManager need a little bit of time before deviceMotion.attitude
values are valid?
(2) Is there a proper way to determine when deviceMotion.attitude has valid
values?
Thanks,
Todd
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