I updated my MacOS from El Capitan to Sierra, previously I'm using xcode 6.4. when I update OS xcode version doesn't support to open in new OS. So, I have installed xcode 8.3 version run the application in simulator with black space on top and bottom.
I have changed view controller size from inferred to free form and trying to update frames using editor->Resolve auto layout issues. but the option is in disable state.