I have signature view, when signature is done I reduce view and save UIBezierPath. When I set UIBezierPath to small view and call setNeedsDisplay, view doesn't draw lines. Maybe problem in scale?
Big view
Reduced view
After setting path and calling setNeedsDisplay
Try to use:
self.layer.transform = CATransform3DMakeScale(1./3., 1./3., 1);
this will make your view 3 times smaller but the actual drawing will be in same size, so coordinates in your path wont be messed up.
For showing SignatureView just make the scale normal like this:
self.layer.transform = CATransform3DIdentity
Good luck ;)