how to rotate CALayer at one point

Question

how to rotate CALayer at one selected point.

Answer 1

Check out the CA documentation here.

You want to set the transform to a CATransform3DRotate, for example:

CATransform3D current = myLayer.transform;
myLayer.transform = CATransform3DRotate(current, DEGREES_TO_RADIANS(20), 0, 1.0, 0);