Changing the UINavigationController animation style

demo.m

CATransition *transition = [CATransition animation];
transition.duration = 0.3f;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
transition.type = kCATransitionFade;
[self.navigationController.view.layer addAnimation:transition forKey:nil];
[self.navigationController pushViewController:nextVC animated:NO];

UINavigationControllerFade.h

@interface UINavigationController (Fade)

- (void)pushFadeViewController:(UIViewController *)viewController;
- (void)fadePopViewController;

@end

UINavigationControllerFade.m

@implementation UINavigationController (Fade)

- (void)pushFadeViewController:(UIViewController *)viewController
{
    CATransition *transition = [CATransition animation];
    transition.duration = 0.3f;
    transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    transition.type = kCATransitionFade;
	[self.view.layer addAnimation:transition forKey:nil];
	
	[self pushViewController:viewController animated:NO];
}

- (void)fadePopViewController
{
	CATransition *transition = [CATransition animation];
    transition.duration = 0.3f;
    transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    transition.type = kCATransitionFade;
	[self.view.layer addAnimation:transition forKey:nil];
	[self popViewControllerAnimated:NO];
}

@end