how to set iOS 6/7 Deltas programmatically

Question

I was developing a UISplitView app by using Xcode 4.6 when I left iOS6 I had design:

Answer 1

Also, you can use NSFoundationVersionNumber

if (floor(NSFoundationVersionNumber) > NSFoundationVersionNumber_iOS_6_1) {
  // > iOS7
} else {
  // <= iOS6
}