ios 7当仅在横向视图中隐藏选项卡时,一些空间保持为黑色

在我的应用程序中,纵向视图中的选项卡被显示,横向视图中的它被设置为隐藏,这在ios6中工作很顺利,但横向视图中iOS7的选项卡被隐藏,但它的空间保持原样。下面是我的代码。

-(void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
    if(![UICommonUtils isiPad]){

            if(toInterfaceOrientation == UIDeviceOrientationLandscapeRight || toInterfaceOrientation == UIDeviceOrientationLandscapeLeft) {

                [UICommonUtils hideTabBar:self.tabBarController];

            } else if(toInterfaceOrientation == UIDeviceOrientationPortrait || toInterfaceOrientation == UIDeviceOrientationPortraitUpsideDown){

                [UICommonUtils showTabBar:self.tabBarController];
            }
      }
}

隐藏选项卡栏

+(void)hideTabBar:(UITabBarController *)tabbarcontroller
{
    CGRect screenRect = [[UIScreen mainScreen] bounds];

    float fHeight = screenRect.size.height;
    if(  UIInterfaceOrientationIsLandscape([UIApplication sharedApplication].statusBarOrientation) )
    {
        fHeight = screenRect.size.width;
    }

    for(UIView *view in tabbarcontroller.view.subviews)
    {
        if([view isKindOfClass:[UITabBar class]])
        {
            [view setFrame:CGRectMake(view.frame.origin.x, fHeight, view.frame.size.width, view.frame.size.height)];
        }
        else
        {
            [view setFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width, fHeight)];
            view.backgroundColor = [UIColor blackColor];
        }
    }
}

显示选项卡

+(void)showTabBar:(UITabBarController *) tabbarcontroller
{
    CGRect screenRect = [[UIScreen mainScreen] bounds];
    float fHeight = screenRect.size.height - 49.0;

    if(  UIInterfaceOrientationIsLandscape([UIApplication sharedApplication].statusBarOrientation) )
    {
        fHeight = screenRect.size.width - 49.0;
    }
    for(UIView *view in tabbarcontroller.view.subviews)
    {
        if([view isKindOfClass:[UITabBar class]])
        {
            [view setFrame:CGRectMake(view.frame.origin.x, fHeight, view.frame.size.width, view.frame.size.height)];
        }
        else
        {
            [view setFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width, fHeight)];
        }
    }
}