问题
i currently have a xcode 5 (ios 7) based universal app (hence two storyboards) and I am thinking of updating it to ios 8.
Is there a way / best approach to migrate the two storyboards into a universal single storyboard?
I cant see a convert option in xcode 6.
来源：https://stackoverflow.com/questions/26087401/how-do-i-upgrade-ios7-universal-app-to-xcode-6-based-universal-storyboard-app