使segue从“推”向相反的方向移动，但没有什么不同？

Question

这是我目前用于动画的代码，它在默认的“推送”功能的相反方向“推”：

UIViewController *sourceViewController = (UIViewController*)[self sourceViewController];
    UIViewController *destinationController = (UIViewController*)[self destinationViewController];

    CATransition *animation = [CATransition animation];
    [animation setDuration:0.5];
    [animation setType:kCATransitionPush];
    [animation setSubtype:kCATransitionFromLeft];
    [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];


    [sourceViewController.navigationController.view.layer addAnimation:animation
                                                                forKey:kCATransition];

    [sourceViewController.navigationController pushViewController:destinationController animated:NO];

虽然与默认的推送动画略有不同。它在离开屏幕之前逐渐变黑，而标准按钮在被推离屏幕之前仅稍微渐渐变为灰色。

我想使它与推动动画相同，但方向相反。