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I got this error despite doing the whole project programmatically. The app still works fine, and I never got the error until I started playing around with the app's AppDelegate application() function. Here's relevant code for that file:

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

var window: UIWindow?

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

    window = UIWindow(frame: UIScreen.main.bounds)
    window?.makeKeyAndVisible()

    window?.rootViewController = UINavigationController(rootViewController: FirstViewController())
    ...
    return true
}

Relevant parts in Xcode terminal:

Unknown class _TtC8<appName>20MasterViewController in Interface Builder file.
Unknown class _TtC8<appName>20DetailViewController in Interface Builder file.

All other similar errors (like this) do not have the _TtC8 part. I cannot find where this is coming from, "Find in workspace..." for "_TtC8" returned nothing.

What I've tried so far:

  • Resetting content and setting in simulator

  • Deleting app from simulator

Both did nothing to the error.

I know this error is related to the storyboard, so is there a way to run the application without the storyboard, since I haven't used it and won't?

Community
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Kyle
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1 Answers1

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Try clearing your main interface entry in General of project settings if you want a custom window and rootVC.

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Sharath
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