objective c - Determine when iPhone is on its back -


is there anyway determine when iphone on back?

this on surface or user holding in hands , shifts phone laying flat in mid-air.

i know iphone has gyro , accelerometer not sure how can used find out.

have @ uideviceorientation:

typedef ns_enum(nsinteger, uideviceorientation) {     uideviceorientationunknown,     uideviceorientationportrait,            // device oriented vertically, home button on bottom     uideviceorientationportraitupsidedown,  // device oriented vertically, home button on top     uideviceorientationlandscapeleft,       // device oriented horizontally, home button on right     uideviceorientationlandscaperight,      // device oriented horizontally, home button on left     uideviceorientationfaceup,              // device oriented flat, face     uideviceorientationfacedown             // device oriented flat, face down };

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