Application windows are expected to have a root view controller at the end of appliaction launch.

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这个警告是新版XCode和ios6中出现的,解决方法是加一句[self.window setRootViewController:rootController];

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

{

………………

[self.window setRootViewController:rootController];

………………

}

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