Is it safe to conditionally code for iOS 6 and 7 by calling +class?

Question

For example there is a new class in iOS 7 that does not exist in iOS 6. I want to use this new class. My app must stay compatible with iOS 6. So I read in some places that you can now do this:

if ([NSURLSessionConfiguration class]) {
    // only in iOS 7        
} else {
    // do it iOS6 way
}

Is this safe to do in any iOS 6 version or should we still use NSClassFromString?

Answer 1

YES, this is safe.

This is the correct and recommended way of checking to see if certain classes are available to be used.