objective c - Xcode 6 Swift code completion not working

Question

Using Xcode 6 GM seed my code completion has stopped working. It was working the other day. I was trying to get the unwind segue work around to work. I had made an Objc header file and assigned it as a header for a Swift class.

At this point I get code completion with an Objective-c project. But, not with a Swift project.

I have tried restarting Xcode, making a new empty project.

Answer 1

Just go in user->Library->Developer->Xcode->DerivedData and delete the Data of folder(Derived data) and restart Xcode.