[UIView transitionFromView:self.test2 toView:self.test1 duration:2.0 options:UIViewAnimationOptionTransitionFlipFromLeft completion:^(BOOL finished) {
        [self.test2 removeFromSuperview];
}];我想把self.view上的test1和test2反转一下,但是效果却是self.view也会反转,如何规定只能反转test1和test2呢?