How to fix "Unknown class RootViewController in Interface Builder file" ios6
ios6, iphone
Solution
The error says that there is object whose class name is RootviewController in the xib .Open the xib/storyboard as source (Right click and open as source code) and search RootviewController. Find where the tag comes and find the object and change it to valid object.
Problem
I've read a number of similar posts but I cannot get an answer that works for me. I have this beginning in my AppDelegate: ``` //LOAD WINDOWS self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; [self.window makeKeyAndVisible]; if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) { self.initialViewController = [[InitialViewController alloc] initWithNibName:@"InitialViewController" bundle:nil]; [self.window setRootViewController:self.initialViewController]; } else { self.patternViewController = [[PatternViewController alloc] initWithNibName:@"PatternView_iPhone" bundle:nil]; [self.window setRootViewController: self.patternViewController]; } return YES; ``` This is working for the iPad version, but not for the iPhone. I get these messages in the console: - Unknown class RootViewController in Interface Builder file. - Application windows are expected to have a root view controller at the end of application launch The PatternView_iPhone xib is of the PatternViewController class. In the project summary, I have these settings: and