The Euler rotation about the z axis (in radians).
- iOS 7.0+
- macOS 10.9+
- tvOS 9.0+
- watchOS 3.0+
The default value is
0, which indicates no rotation. A positive value indicates a counterclockwise rotation. When the coordinate system is rotated, it affects the node and its descendants. The rotation affects the node’s
frame property, hit testing, rendering, and other similar characteristics.