Today I updated Unity4 Pro to 4.1.2 & now when I build I get the following error when X-code builds.
_didResignActive = YES;
// the ERROR it states
RollBall/RollAballTest1/Classes/AppController.mm:486:19: Use of undeclared identifier '_surface'
I notice in the following Vuforia iOs thread they talk about a similar situation... but I'm not sure how to rectify it.