The yaw angle of the face specified in degrees.
- iOS 6.0+
- macOS 10.10+
- Mac Catalyst 13.0+
The yaw angle represents the rotation of the face around the vertical axis. A value of
0 yields a face that is looking directly at the camera, whereas a yaw angle of
90 degrees yields a face whose eye line is perpendicular to that of the camera.
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.