Расширение на Magnus 'great & amp; полный ответ, я создал версию, которая работает на подслоях:
-(void)setAnchorPoint:(CGPoint)anchorPoint forLayer:(CALayer *)layer
{
CGPoint newPoint = CGPointMake(layer.bounds.size.width * anchorPoint.x, layer.bounds.size.height * anchorPoint.y);
CGPoint oldPoint = CGPointMake(layer.bounds.size.width * layer.anchorPoint.x, layer.bounds.size.height * layer.anchorPoint.y);
CGPoint position = layer.position;
position.x -= oldPoint.x;
position.x += newPoint.x;
position.y -= oldPoint.y;
position.y += newPoint.y;
layer.position = position;
layer.anchorPoint = anchorPoint;
}