What solved this issue for me was actually deleting the class from the project.
Steps:
- In the project file explorer (left panel) find the class and right click -> Delete
- Remove reference (do not move to trash as you will lose the class for good)
- Right click on the folder that contained the class -> Add files to …
- Find the class you just deleted in the file system
This seems to force Xcode to link the class back into the storyboard.
Note: for me the following did not work:
- Closing Xcode
- Cleaning the project
- Deleting the class name from the storyboard and re-entering it
I think this is a bug on Apple’s part