模态跳转的动画方法（系统提供）

    TestViewController *vc = [[TestViewController alloc]init];
    /**
     UIModalTransitionStyleCoverVertical   底部滑出
     UIModalTransitionStyleFlipHorizontal  翻转
     UIModalTransitionStyleCrossDissolve   渐显
     UIModalTransitionStylePartialCurl     翻页

     */
    vc.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    
    [self presentViewController:vc animated:YES completion:^{
        
    }];