CGAffineTransformMakeRotation counter clockwise always

Question

I an trying to animate a UIImageView to rotate counter clockwise when a user touches it and moves its finger on it in clockwise direction.
Basically I want

Answer 1

The technique I've used is to divide the rotation angle by 2 and separate the rotate into two separate animations, linked by the completion: parameter of animateWithDuration:delay:options:animations:completion:. But, since the view has been rotated to its current position, you need to start with that position and "unrotate" back to zero, vs attempting to rotate CCW from zero.