pub unsafe static AVCaptureLensPositionCurrent: c_floatAvailable on crate feature
AVCaptureDevice only.Expand description
A special value that may be passed as the lensPosition parameter of setFocusModeLockedWithLensPosition:completionHandler: to indicate that the caller does not wish to specify a value for the lensPosition property, and that it should instead be set to its current value. Note that the device may be adjusting lensPosition at the time of the call, in which case the value at which lensPosition is locked may differ from the value obtained by querying the lensPosition property.
See also Apple’s documentation