gistfile1.m

        [UIView animateWithDuration:PRESENT_DURATION
                              delay:0
                            options:UIViewAnimationOptionCurveEaseIn
                         animations:^{
                             // THIS GETS CALLED
                             toVC.view.transform = CGAffineTransformIdentity;
                         } completion:^(BOOL finished) {
                             // DOESNT GET HERE
                             [transitionContext completeTransition:YES];
                         }];