When I change my ViewController class name after it's been created and assigned to a view controller in storyboards I run into problems with the IBOutlets of that view controller, and Xcode does not automatically show the corresponding class in the assistant editor when I click the scene.
I've changed the name of the actual file, the class declaration within the file, and the class of the view controller in storyboards. Am I missing something else?
A) If you're using Xcode 9 or later, just select the class name, right click -> Refactor -> Rename
Ex.: class MapViewController: UIViewController - just select the "MapViewController", then right click -> Refactor -> Rename
This will change the name file name, class name and take care of the storyboard class name.
B) If you can't use the method A, then manually rename the class name, file name (.swift), then go to the storyboard and replace the class name of the view controller. You may have issues with the outlets. In this case try to close Xcode and re-launch then remove all IBOutlets and reconnect them again.