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How to type cast a masterViewController when using splitViewControllers

Forums > Swift

I've got the following code:

guard let splitViewController = self.window?.rootViewController
          as? UISplitViewController else {
          fatalError("Missing SplitViewController")
        }

        guard let masterNavController = splitViewController.viewControllers.first
          as? UINavigationController,
          let masterViewController = masterNavController.topViewController
          as?  MasterViewController else {
          fatalError("Missing MasterViewController")
        }

        splitViewController.preferredDisplayMode = .primaryHidden
        splitViewController.delegate = masterViewController

I've read and understood the relevant swift.org reference, yet I don't know what I should conditionally type cast masterViewController constant as. I'm getting 'MasterViewController is an undeclared type' compiler error.

   

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