Main UI difference in iOS 6 and iOS 7 is that status bar is included inside the viewcontroller in iOS 7. it means your view controller is 20 px greater than iOS6. you have to adjust your items.
First design your items according to iOS 6 which is better way and you must have a lot of practice of doing that, now set Δy to 20 for every item.
Or design your items according to iOS 7 and set Δy to -20
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