UINavigationController向上向下划動切換動畫

    

 CATransition *tran = [CATransition animation];

    tran.duration = .4f;

    tran.type = kCATransitionPush;

    tran.subtype = kCATransitionFromTop; //Bottom for the opposite direction

    tran.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];

    tran.removedOnCompletion  = YES;

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

    

    [self.navigationController pushViewController:controller animated:NO];