The roll angle of the face specified in degrees.
- iOS 6.0+
- macOS 10.10+
- Mac Catalyst 13.0+
The roll angle represents the side-to-side tilt of the face relative to the metadata’s bounding rectangle. A value of
0 yields a face that is level relative to the picture, whereas a value of
90 yields a face that is perpendicular relative to the picture.
You must check the value of the
has property before accessing this property. If the value in the
has property is
NO, reading the value in this property raises an exception.