问题
Looking at my project in the symbol navigator view, I noticed each class listed twice. They are identical, but the code runs fine, what is going on?
回答1:
Even if Xcode 6 isn't in Beta anymore, there are still a lot of issues(Editor stops working etc.). In most cases these errors can be resolved by simply restarting Xcode.
If that doesn't help you, try to Clean your project: Product->Clean. Also you could clean Xcode manually by deleting all files inside ~/Library/Developer/Xcode/DerivedData
来源：https://stackoverflow.com/questions/28549848/xcode-6-symbol-navigator-shows-each-class-twice