Objective-C generate UUID

Question

function b(
  a                  // placeholder
){
  return a           // if the placeholder was passed, return
    ? (              // a random number from 0 to 15
      a ^            // unless b is 8,
      Math.random()  // in which case
      * 16           // a random number from
      >> a/4         // 8 to 11
      ).toString(16) // in hexadecimal
    : (              // or otherwise a concatenated string:
      [1e7] +        // 10000000 +
      -1e3 +         // -1000 +
      -4e3 +         // -4000 +
      -8e3 +         // -80000000 +
      -1e11          // -100000000000,
      ).replace(     // replacing
        /[018]/g,    // zeroes, ones, and eights with
        b            // random hex digits
      )
}

Edit: Using the selected answer is the best way, please ignore this question. I'm writing this to appeal to Stack Overflows character limit...

What do you mean by "use this same function"? Do you want to _call_ JS code from ObjC, _rewrite_ the function into ObjC, or _find an equivalent_ in the Cocoa framework? — jscs, Mar 13 '16 at 21:49
@JoshCaswell I'd like to rewrite the function in ObjC. I'll update the question. — Cole Roberts, Mar 13 '16 at 21:50
SO is not a rewrite my code service and calling BryanChen an ass just got you a down vote and a moderator flag. — matt, Mar 13 '16 at 21:58

score 26 · Accepted Answer · answered Mar 13 '16 at 21:44

26

The easiest way to get a UUID in Obj-C is to use the UUID class:

NSUUID *uuid = [NSUUID UUID];
NSString *str = [uuid UUIDString];

answered Mar 13 '16 at 21:44

EricS

9,650
2
38
34

Any idea how I could recreate the exact function above though? I appreciate it. – Cole Roberts Mar 13 '16 at 21:49
@ColeRoberts `NSUUID` conform to RFC 4122 version 4 and are created with random bytes and that would be a different question. You should either make a new thread or edit current question. – Cai Mar 13 '16 at 22:04
My Javascript isn't quite good enough to translate it verbatim. Sorry. – EricS Mar 14 '16 at 00:08

score 2 · Answer 2 · answered Mar 13 '16 at 21:56

Do it the following way. You can add it as utility API-

+ (NSString *)uniqueIdForObject
{
 CFUUIDRef uniqueString = CFUUIDCreate(NULL);
 CFStringRef isString = CFUUIDCreateString(NULL, uniqueString);
 CFRelease(uniqueString);
 return (NSString *) isString;
}

Objective-C generate UUID

2 Answers2