Xcode 6 swift code completion does not work properly - Xcode 6 swift code completion not working

problem ：

Using Xcode 6 GM seed my code completion has stopped working. Use Xcode 6 GM Seed my code finished and stopped working .It was working the other day. It was working a few days ago .I was trying to get the unwind segue work around to work. I tried to make unwindwind segue Work .I had made an Objc header file and assigned it as a header for a Swift class. I made a Objc The header file , And designated it as Swift Class .

At this point I get code completion with an Objective-c project. here , I use Objective-c Project completion code .But, not with a Swift project. however , No Swift project .

I have tried restarting Xcode, making a new empty project. I try to restart Xcode, Make a new empty project .

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Solution ：

Reference resources ： https://stackoom.com/en/question/1kbaL