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.

Answer 2

This fix from apple dev forums works for me. I have had autocomplete issues with Xcode 6.1/Yosemite.

1. Quit Xcode.
2. Restart the computer (this is to clear any in-memory caches).
3. Delete the contents of the DerivedData folder (~/Library/Developer/Xcode/DerivedData), precisely run, a) cd ~/Library/Developer/Xcode/DerivedData/
   b) rm -rf *

---

4. (Try this if Steps 1-3 dont really work as it rebuilds the cache later on restart which takes time) Delete the contents of folder ~/Library/Caches/com.apple.dt.Xcode, i.e.,
   a) cd ~/Library/Caches/com.apple.dt.Xcode
   b) rm -rf *

Now launch Xcode once more…