The most universal solution is to change SWIFT_OBJC_INTERFACE_HEADER_NAME (“Objective-C Generated Interface Header Name”) under Project’s, not Targets, Build Settings, to:

• $(PROJECT_NAME)-Swift.h — one per project;
• $(SWIFT_MODULE_NAME)-Swift.h — one per module (default value).

Then import the Project Header, example:

#import MyProjectName-Swift.h