UINavigationController custom pop/push transition animation

UINavigationController+Fade.h

/*
Copied and pasted from David Hamrick's blog:

Source: http://www.davidhamrick.com/2011/12/31/Changing-the-UINavigationController-animation-style.html
*/

@interface UINavigationController (Fade)

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

@end

UINavigationController+Fade.m

/*
Copied and pasted from David Hamrick's blog:

Source: http://www.davidhamrick.com/2011/12/31/Changing-the-UINavigationController-animation-style.html
*/

@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

UINavigationControllerFade.h

/*
Copied and pasted from David Hamrick's blog:

Source: http://www.davidhamrick.com/2011/12/31/Changing-the-UINavigationController-animation-style.html
*/

@interface UINavigationController (Fade)

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

@end

UINavigationControllerFade.m

/*
Copied and pasted from David Hamrick's blog:

Source: http://www.davidhamrick.com/2011/12/31/Changing-the-UINavigationController-animation-style.html
*/

@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