To easily create a new UUID (aka GUID) in Cocoa, add the following method as a category to NSString:
+ (NSString*) stringWithUUID {
CFUUIDRef uuidObj = CFUUIDCreate(nil);//create a new UUID
//get the string representation of the UUID
NSString *uuidString = (NSString*)CFUUIDCreateString(nil, uuidObj);
CFRelease(uuidObj);
return [uuidString autorelease];
}
That’s it, just 4 lines of code. There’s really no need to deal with an entire UUID class. All you ever need to do with UUIDs is create them, compare them, and store/retrieve them. + stringWithUUID handles creation. The string it returns responds to - isEqual:, and is easy to write or read using the mature Foundation APIs. What more could you ask for from a UUID object?
Simpler Ways:
You might only need: [[NSProcessInfo processInfo] globallyUniqueString]. As the name implies, it gives you a UUID that can be used to identify a process.
If you want a UUID without messing with compiled code, the uuidgen command-line tool generates them, or you can use this website.