Xcode 6 Swift code completion not working

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.

Solution 1:

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

Solution 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…

Solution 3:

I experienced a serious breakdown of code completion because I had some 'notes' after the @end statement of my .m file which were as follows:

/*
 NSAlertFirstButtonReturn, NSAlertSecondButtonReturn, NSAlertThirdButtonReturn
 */

These lines can appear before the @end statement without destroying code completion.

Solution 4:

There's an easier way to delete the Derived Data from within Xcode (no need to open finder or restart):

Xcode Organizer -> Projects -> (Your Project) -> Delete Derived Data

Solution 5:

I just recently had this problem. Autocomplete did not work ...and when i typed for example tableView.... it did not give me the different functions available.

I tried the following and it worked for me.

1. Xcode Organizer -> Projects -> (Your Project) -> Delete Derived Data

2. delete the file ~/Library/Developer/Xcode/DerivedData/ModuleCache

3. Restart xcode

Hope this works