I am not an Obj C pro, but I should write some code in Objective C and bridge a Swift code to it.
I success in importing the Generated Header to the .m file:
@property (nonatomic, readwrite, strong) Card *card;
In your case, since all you need to do is declare a property of type
Card*, you don't actually need to import the header—you can just forward-declare the class with
@class Card; before using it.