Is it possible to check whether an identifier exists in a storyboard before instantiating the object?

Question

In my code I have this line, but I was wondering if there is way to check whether @\"SomeController\" exists before I use it with the \"instantiateViewControllerWit

Answer 1

@Kevin's solution works. Here is a pretty the same piece of code for Swift 3 as function, that I am using in my code:

func instantiateViewController(fromStoryboardName storyboardName: String, withIdentifier identifier: String) -> UIViewController? {
    let mainStoryboard = UIStoryboard(name: storyboardName, bundle: nil)
    if let availableIdentifiers = mainStoryboard.value(forKey: "identifierToNibNameMap") as? [String: Any] {
        if availableIdentifiers[identifier] != nil {
            if let poiInformationViewController = mainStoryboard.instantiateViewController(withIdentifier: identifier) as? UIViewController {
                return viewController
            }
        }
    }
    return nil
}

Use this function as follows:

if let viewController = self.instantiateViewController(fromStoryboardName: "YourStoryboardName", withIdentifier: "YourViewControllerStoryboardID") {
    // Here you are sure your viewController is available in the Storyboard
} else {
    print("Error: The Storyboard with the name YourStoryboardName or the Storyboard identifier YourViewControllerStoryboardID is not available")
}