CATransition *transition = [CATransition animation];

transition.duration = 0.5;//动画时间

transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];

transition.type = kCATransitionPush;//动画类型

transition.subtype = kCATransitionFromBottom;//动画方向

transition.delegate = self;//指定代理

[self.navigationController.view.layer addAnimation:transition forKey:nil];//指定适用层

然后在进行push就可以了