navigationController pushViewController动画

    CATransition *animation = [CATransitionanimation];
    [animation setDuration:0.3];
    [animation setType: kCATransitionMoveIn];
    [animation setSubtype: kCATransitionFromTop];
    [animation setTimingFunction:[CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionDefault]];
    [self.navigationController pushViewController:tabbar animated:NO];
    [self.navigationController.view.layeraddAnimation:animation forKey:nil];