如何在iPhone 5中获得黑色边框

When I first updated Xcode and tested my app in the iPhone 5 simulator, the app ran perfectly with black borders at the top and bottom. Then, something popped up asking if I wanted Xcode to auto-resize the app so that it would fit the entire screen. I clicked yes, and now everything is messed up. Is there a way to get the borders back? I want to submit an update for my app as soon as possible. Thank you!When I first updated Xcode and tested my app in