uinavigationcontroller - UINavigationControllers は、iOS7 のナビゲーション コントローラーでは許可されていません

Question

私のアプリの 1 つが起動を拒否し、iOS7 でこの例外が発生しています。例外の文言、特に感嘆符は、エンジニアが投げかけた癇癪のように見えます。コードは iOS 5/6 で問題なく動作し、それに関連する警告はありません。xcode 5 には警告もありません。省略されたコード スライスを含みます。これを行った理由は、アプリのナビゲーション全体を制御する独自のカスタム タブバーを作成するためです。

2013-06-10 22:24:52.862 [3375:c07] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'UINavigationControllers are not allowed in a navigation controller!'

*** First throw call stack:
(0x2c56028 0x29da902 0x1009873 0x2cd22fd 0x2cd2232 0x2c4fae5 0x1009716 0x100943f 0x1008ec5 0x9905 0xef05f9 0xef0daa 0xef21dc 0xf07c6c 0xf081d9 0xef3e55 0x3d6ace2 0x3d6a7ed 0x2bd18d5 0x2bd160a 0x2bfc032 0x2bfb59f 0x2bfb3eb 0xef1960 0xef3b6b 0x8e2d 0x8d95)
libc++abi.dylib: terminating with uncaught exception of type NSException

コード：

UIViewController *homeController, *contactController, *procedureController, *wizardController, *teamController, *askController;

homeController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
UINavigationController *homeNavController = [[UINavigationController alloc] initWithRootViewController:homeController];

wizardController = [[ProcedureWizardController alloc] initWithNibName:@"ProcedureWizardController" bundle:nil];
UINavigationController *wizardNavController = [[UINavigationController alloc] initWithRootViewController:wizardController];

askController = [[AskViewController alloc] initWithNibName:@"AskViewController" bundle:nil];
UINavigationController *askNavController = [[UINavigationController alloc] initWithRootViewController:askController];

teamController = [[TeamViewController alloc] initWithNibName:@"TeamViewController" bundle:nil];
UINavigationController *teamNavController = [[UINavigationController alloc] initWithRootViewController:teamController];

procedureController = [[ProcedureViewController alloc] initWithNibName:@"ProcedureViewController" bundle:nil];
UINavigationController *procNavController = [[UINavigationController alloc] initWithRootViewController:procedureController];


contactController = [[ContactViewController alloc] initWithNibName:@"ContactViewController" bundle:nil];
UINavigationController *contactNavController = [[UINavigationController alloc] initWithRootViewController:contactController];

viewControllers = [NSArray arrayWithObjects:homeNavController, wizardNavController, askNavController, teamNavController, procNavController, contactNavController, nil];

navController = [[UINavigationController alloc] init];;

navController.viewControllers = [NSArray arrayWithArray:viewControllers];