One Quickie

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Rotating a layer by 90 degrees (Core Animation->General)

To rotate a 'flat' layer, gotta convert degrees to radians, and then rotate around a vector along the z axis.

hooverLayer.transform = CATransform3DRotate(CATransform3DIdentity,
                                            90.0 * M_PI / 180.0,
                                            0.0f, 0.0f, 1.0f);