This solution "Can't Ctrl drag views to header file" didn't work for me because even if the assistant is in Automatic mode I don't see my file.
I am trying to create a new IBOutlet connection, but this doesn't work. I open the xib file at the left side of my screen and I open manually the .m file from the assistant editor. I select it manually because it doesn't show up in the Automatic selection. And every time I try to connect it to my .m file it just doesn't happen.