how to release a tabbarcontroller?

A UITabBarController's viewControllers are navigationCont开发者_C百科roller, when I release the tabbarcontroller, I found the memory would not released ?

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You cant release them if you create them in .xib file. They will be released then your application end work !!!

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If you are working in code you probably need to release the navigationControllers after adding them to the tabBarController...

tabBarController = [[UITabBarController alloc] init];

NSMutableArray *controllerArray = [[NSMutableArray alloc] initWithCapacity:2];

UINavigationController *localNavigationController;

AccountViewController *accountViewController = [[AccountViewController alloc] init];
localNavigationController = [[UINavigationController alloc] initWithRootViewController:accountViewController];
[controllerArray addObject:localNavigationController];
[localNavigationController release];
[accountViewController release];

AccountHistoryViewController *accountHistoryViewController = [[AccountHistoryViewController alloc] init];
localNavigationController = [[UINavigationController alloc] initWithRootViewController:accountHistoryViewController];
[controllerArray addObject:localNavigationController];
[localNavigationController release];
[accountHistoryViewController release];

[tabBarController setViewControllers:controllerArray];
[controllerArray release];

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you should release them in dealloc method of app delegate class

- (void)dealloc {

   [tabbarcontroller release]; 
   [window release];
    [super dealloc];
}