You need to set Delta of your UIViewController 's view.
Switch Story board to ios6.1 or later from utility area (1st item).
Then select view of your UIViewController and in size inspector menu in utility area there will be delta section below frame. There will be triangle before every delta. Change Triangle y to 64 (you should be on "ios6.1 or later" of your storyboard).
This means when storyboard is opened in ios7 then your UIViewController's view will start from 64 automatically . 64 is UINavigationbar height + UIStatusbar height.
If your UIViewController dont have UINavigationBar then Delta y = 20,(you should be on "ios6.1 or later" of your storyboard).
Once you change delta's in one ios it will automatically change its opposite.
If you need help on Deltas visit : Interface Builder: What are the UIView's Layout iOS 6/7 Deltas for?