objective-c - TabBar + iOS 6 + iPad tabBar 消失

Question

我有在 iOS 5 上运行良好的 iPad 应用程序。我的应用程序根视图控制器实现了 UITabBarDelegate 和 UINavigationControllerDelegate。但在 iOS 6 上，我只能看到一次 tabBar - 第一次运行。在第二。第三个等运行 tabBar 消失。那么WFT？%-)

这是我的 AppDelegate 的 applicationDidFinishLaunching:application:

- (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 标头的片段：

@interface LTPadMainController : LTAutorotateController <UINavigationControllerDelegate, UITabBarDelegate>

以及 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;
}