I have an iOS project written with Objective-C. I created an Swift class in the project, the bridging header file for accessing objective-c in Swift is generated successfull
I ran into the same issue yesterday and worked for hours to fix it with no avail. Others may have been in the same boat as I. I did all of the steps described above, but nothing worked.
The cause of mine breaking was because of project name artifacts all over my project (from previously changing its name improperly).
If all of the above steps fail, I would suggest doing like I did and renaming your project so that Xcode can reset somethings... That solved the problem for me. Doing so worked like a charm!