Sounds like you didn't set the initial view controller. Open the storyboard and see if there's a big arrow pointing to the scene. If not, check the 'is initial View Controller' box in the attribute inspector.
I am having the same problem, simulator is blank when I run and Xcode brings up the AppDelegate.swfit file.
I tried the "check the 'is initial View Controller' box in the attribute inspector." advice but didn't work. Any other suggestion?
Does this only affect your main project? If you create a new project from the Cocoa Touch template, does it have the same problem?
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Apple Developer Relations, Developer Technical Support, Core OS/Hardware
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What you need to understand is that xcode and the simulator are almost useless.
Have you looked at any of the other OS ecosystems? You'll probably live longer....