Objective C generate random id for object that does not repeat

Question

I want to generate unique ids for object identification, I've come across [[NSUUID UUID] UUIDString] , can it be used for unique identification? or there's a better approach for generating?

Answer 1

Yes: NSUUID generates a unique ID.

From Apple:

UUIDs (Universally Unique Identifiers), also known as GUIDs (Globally Unique Identifiers) or IIDs (Interface Identifiers), are 128-bit values. UUIDs created by NSUUID conform to RFC 4122 version 4 and are created with random bytes.

From RFC 4122 :

A UUID is 128 bits long, and can guarantee uniqueness across space and time.

Answer 2

You may use the following

CFUUIDRef udidCFUUIDRef = CFUUIDCreate(NULL);
NSString *UUIDString = (NSString *) CFBridgingRelease(CFUUIDCreateString(NULL, udidCFUUIDRef));