IPad PortraitUpsideDown问题

Question

我在appdelegate中添加了一个视图。我已将此视图添加到不同的控制器中

if((orientation == UIInterfaceOrientationLandscapeLeft)||(orientation == 
                                                     UIInterfaceOrientationLandscapeRight))
    {

        [topview setFrame:CGRectMake(0, 0, 1024, topview.frame.size.height)];

    }
       else  if ((orientation == UIInterfaceOrientationPortrait)||(orientation ==
                                        UIInterfaceOrientationPortraitUpsideDown)) 
       {

           [topview setFrame:CGRectMake(0, 0, 768, topview.frame.size.height)];


       }
    [self.view addSubview:topview];

此topView包含按钮。但它不能用于UIInterfaceOrientationPortraitUpsideDown，虽然按钮在正确的位置可见。

有没有解决方案？