TabBar + iOS 6 + iPad tabBar消失

Question

我有iPad应用程序在iOS 5上正常工作。我的应用程序根viewController实现了UITabBarDelegate和UINavigationControllerDelegate。但是在iOS 6上我只能看到tabBar一次 - 第一次运行。在第二个。第三个等运行tabBar消失。 WFT？ ％ - ）

这是我的AppDelegate的applicationDidFinishLaunching：应用程序：

- (void)applicationDidFinishLaunching:(UIApplication*)application
{
...
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
    {
        CGRect mainViewFrame = _window.frame;
        CGRect statusBarFrame = [UIApplication sharedApplication].statusBarFrame;
        mainViewFrame.origin.y = CGRectGetHeight(statusBarFrame);
        mainViewFrame.size.height -= CGRectGetHeight(statusBarFrame);
        [self padMainController].view.frame = mainViewFrame;

        [_window setRootViewController:[self padMainController]];
    }
...
}

这是padMainController标题的片段：

@interface LTPadMainController : LTAutorotateController <UINavigationControllerDelegate, UITabBarDelegate>

和LTAutorotateController的片段：

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return ((UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad && UIDeviceOrientationIsLandscape(interfaceOrientation)) || (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone && UIDeviceOrientationIsPortrait(interfaceOrientation)));
}

- (BOOL)shouldAutorotate
{
    return YES;
}

- (NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskLandscape;
}