final class SampleViewController: StoryboardBackedViewController {
    // Unfortunately this must be an IUO var, so that we can set the value after super.init
    private var member: Foo!
    
    // Proper dependency injection in a storyboard backed VC!
    init(foo: Foo) {
        super.init(storyboardIdentifier: "SampleViewControllerIdentifier")

        // We have to set the members *after* calling super.init, since it changes the instance of `self`.
        self.member = foo
    }
}