Currently the CMAKE_XCODE_EFFECTIVE_PLATFORMS property acts only as a kind of toggle switch to enable iOS project layout features. But instead of relying on this undocumented property, better detect the presence of an iOS SDK directly.
In contrast to Mac OS X App bundle layout the iOS one lacks the Contents/MacOSX structure. See also the Bundle Structures documentation in Mac Developer Library: https://developer.apple.com/library/mac/documentation/CoreFoundation/Conceptual/CFBundles/BundleTypes/BundleTypes.html For now detect iOS targets by checking the SDK name/path.