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Editorial Team
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Asked: 2026-06-11T23:31:34+00:00

I used codes below to init a root view controller – (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary

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I used codes below to init a root view controller

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 

{

[window addSubview:rootViewController.view];
UINavigationController *nav=[[UINavigationController alloc]initWithRootViewController: rootViewController  ];
}

it worked well on ios 4 about 2 years,ios5 1 years, there is no any problem when start to run the app
but on ios6 it crashed and reported

* Terminating app due to uncaught exception ‘UIViewControllerHierarchyInconsistency’, reason: ‘adding a root view controller as a child of view controller:’

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1 Answer

  1. Editorial Team

    ‘rootViewController’ is already in your view hierarchy. Remove it from whatever other container its in (window.rootViewController ?) first (window.rootViewController = nil).

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