A Boolean value indicating whether the view or any of its ancestors has ever had a rotation factor applied to its frame or bounds.
- macOS 10.0+
The value of this property is
true if the view or any of its ancestors has had its
bounds properties modified at any time. The value is still
true if the rotation factor is changed to a nonzero value and then back to 0.
Use this information to optimize drawing and coordinate calculation. Do not use it to reflect the exact state of the view’s coordinate system.