Can't cast value of type UIViewController to PatternDetailViewController

Question

Am trying to downcast a view controller to a detail view controller but can\'t. Am using Core Data (for the first time). The error is in the prepareForSegue method and reads

Answer 1

Adding to matt answer. Sometimes, you may also need to double check the custom class Module from the Identity inspector.

Your view controller need to belong to a specific Module. So make sure to select a Module from the list. In my case: