iOS 建立UUID

#import "CreateUUID.h"

@implementation CreateUUID

+ (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;

}

@end