How to easily add support for iOS 7?

Question

iOS

There is an application adapted for iOS 6 and 5. It is necessary to add support for iOS 7 with the least effort and without inventing bicycles, leaving support for older operating systems. Click on libraries or good articles.

Answer 1

Looking at how the application is written. It is possible that it will be quite simple to compile it in the new Xcode by installing iOS7 as the Base SDK (usually there is just "Latest iOS", in this case you don't even need to change anything).
If there are errors or some GUI "strangeness", then it is already necessary to specifically work in this direction.
And, of course, test-test-test.
For example, in my application, I only tweaked the top status bar a little.