Adding objective c class that uses swift classes to bridging header Projectname_swift.h not found

Question

I have an objective-c class that uses swift classes. It all works fine.

I wanted to import the objective-c class into a swift class, so I added its header file to the bridging header. All the sudden I got an error the Projectname_swift.h file is not found.

Any ideas how to resolve this issue? Is it actually possible?

Answer 1

a circular reference has been created, making it so the Swift code is unable to compile (which leads to the canary error stating that the _Swift.h file is not found).

i have provided a more in depth answer to a similar questions here and here.

long story short, the documentation explicitly says not to this:

To avoid cyclical references, don’t import Swift code into an Objective-C header (.h) file. Instead, you can forward declare a Swift class or protocol to reference it in an Objective-C interface.

Forward declarations of Swift classes and protocols can only be used as types for method and property declarations.

in order to make your code compile again you will need to remove the #import "Projectname_Swift.h" line from the offending Objective-C header. ideally you can simply move the import statement into your .m file, however if you need to publicly expose the Swift class in your ObjC header, then you must forward declare it using @class SomeSwiftClass;.