How to remove Fade Animation in CATransition

Question

I've tried to remove Fade animation between two views by changing background color of views to clearcolor and remove FadeIn/Out by using

 self.navigationController!.view.layer.removeAnimationForKey("FadeIn")
 self.navigationController!.view.layer.removeAnimationForKey("FadeOut")

and follow according to answer below,

Anyway to remove fade when using CATransition between 2 views?

still get fade animation. Following is my code.

let transition: CATransition = CATransition()
transition.duration = 1
transition.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionDefault)
transition.type = kCATransitionPush
transition.subtype = kCATransitionFromRight      
self.navigationController!.view.layer.removeAnimationForKey("FadeIn")                 
self.navigationController!.view.layer.removeAnimationForKey("FadeOut")
self.navigationController!.view.layer.addAnimation(transition, forKey: kCATransition)
self.navigationController!.popViewControllerAnimated(false)