Fade between view controllers in the UINavigationController

gistfile1.m

// will use a fade transition for the next push or pop on the view controllers stack
-(void) setNavigationTransition
{
    CATransition* transition = [CATransition animation];
    transition.duration = 0.5;
    transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    transition.type = kCATransitionFade;
    [self.navigationController.view.layer addAnimation:transition forKey:nil];
}