I was running into the same issue and couldn’t get my project to import swift into obj-c classes. Using Xcode 6, (should work for Xcode 6+) and was able to do it in this way….
- Any class that you need to access in the .h file needs to be a forward declaration like this
@class MySwiftClass;
- In the .m file ONLY, if the code is in the same project (module) then you need to import it with
#import "ProductModuleName-Swift.h"
Link to the apple documentation about it
https://developer.apple.com/documentation/swift/imported_c_and_objective-c_apis/importing_swift_into_objective-c