How to Create a Universally Unique Identifier (UUID) in iOS

UUID's are 128-bit values which are guaranteed to be unique – typically the value is based on a machines ethernet address combined with the current time since October 15, 1582.

UUID's are string values separated by hyphens, for example, here is how a UUID may look: 14862F23-C76A-2548-2541-0293E3B34398.

The method below creates a UUID and returns a string representation of the same:

Create UUID

- (NSString *)createUUID
{
// Create universally unique identifier (object)
CFUUIDRef uuidObject = CFUUIDCreate(kCFAllocatorDefault);
 
// Get the string representation of CFUUID object.
NSString *uuidStr = [(NSString *)CFUUIDCreateString(kCFAllocatorDefault, uuidObject) autorelease];
 
// If needed, here is how to get a representation in bytes, returned as a structure
// typedef struct {
// UInt8 byte0;
// UInt8 byte1;
// ...
// UInt8 byte15;
// } CFUUIDBytes;
CFUUIDBytes bytes = CFUUIDGetUUIDBytes(uuidObject);
 
CFRelease(uuidObject);
 
return uuidStr;
}

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