当与新班级相关联时，故事板场景显示黑色

I am creating an app and am using storyboards but there is one scene that displays fine when I have just created the interface, but when I assign a new class to the scene it shows up black with just the navigation bar visible. The view is embedded in a UINavigationController and I am trying to display it using a segue that is connected to the UINavigationController.I am creating an app and am using storyboards b