Not sure if it's relevant but I've noticed that since iOS 7, motion-sensitive apps ask for a calibration almost every time, where the phone has to be rolled around until a circle completes. It never used to do that, or only in very specific cases, or when the user clicked a calibration button. That change suggests that perhaps the sensor needs calibrating a lot more often that was previously thought, and maybe your app needs to do the same before it gets reliable values.
--Graham On 11 Jun 2014, at 10:11 am, Todd Heberlein <todd_heberl...@mac.com> wrote: > 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 _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
