present（模态）实现出push的效果

在present加上这个转场动画,取消掉原来的转场动画

　 CATransition *animation = [CATransitionanimation];

    animation.duration = 0.35;

    animation.timingFunction = UIViewAnimationCurveEaseInOut;

    animation.type = kCATransitionPush;

　 animation.subtype = kCATransitionFromRight;

    [self.view.window.layeraddAnimation:animation forKey:nil];

    [self presentViewController:setVC animated:NOcompletion:nil];

在dissmiss加上这个转场动画，取消掉原来的动画效果

　　    CATransition *animation = [CATransition animation];

　animation.duration = 0.35;

　animation.timingFunction = UIViewAnimationCurveEaseInOut;

　animation.type = kCATransitionPush;

　animation.subtype = kCATransitionFromLeft;

　　　[self.view.window.layer addAnimation:animation forKey:nil];

   　   [selfdismissViewControllerAnimated:NOcompletion:nil];

然后就和NavCtl的push效果和back效果几乎一致。