修改push动画的方向

CATransition *animation = [CATransition animation];

animation.duration = 0.4;

animation.timingFunction = UIViewAnimationCurveEaseInOut;

animation.fillMode = kCAFillModeForwards;

animation.type = kCATransitionPush;

animation.subtype = kCATransitionFromBottom;//从底部滑动上去

[self.navigationController.view.layer addAnimation:animation forKey:@"animation"];

[self.navigationController popViewControllerAnimated:NO];