Find Mac OS X version number in objective c

Question

How can I find the version number of Mac OS X (eg. "10.6.7") from my Cocoa Objective-C application?

Answer 1

You could use the same technique that Apple's code uses...

NSDictionary *systemVersionDictionary =
    [NSDictionary dictionaryWithContentsOfFile:
        @"/System/Library/CoreServices/SystemVersion.plist"];

NSString *systemVersion =
    [systemVersionDictionary objectForKey:@"ProductVersion"];

Apple does exactly this to fill in the version number for various system utilities in the function _CFCopySystemVersionDictionary here:

http://opensource.apple.com/source/CF/CF-744/CFUtilities.c

Answer 2

For OS X 10.10+ I think using NSProcessInfo is an easier and safer way to do that:

NSOperatingSystemVersion version = [[NSProcessInfo processInfo] operatingSystemVersion];
NSLog([NSString stringWithFormat:@"%ld.%ld.%ld", version.majorVersion, version.minorVersion, version.patchVersion]);