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74

How to get a UUID in objective c, like in Java UUID is used to generate unique random numbers which represents 128 bit value.

160

Try:

CFUUIDRef udid = CFUUIDCreate(NULL);
NSString *udidString = (NSString *) CFUUIDCreateString(NULL, udid);

UPDATE:

As of iOS 6, there is an easier way to generate UUID. And as usual, there are multiple ways to do it:

Create a UUID string:

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

Create a UUID:

[[NSUUID UUID]; // which is same as..
[[NSUUID] alloc] init]; 

Creates an object of type NSConcreteUUID and can be easily casted to NSString, and looks like this: BE5BA3D0-971C-4418-9ECF-E2D1ABCB66BE

NOTE from the Documentation:

Note: The NSUUID class is not toll-free bridged with CoreFoundation’s CFUUIDRef. Use UUID strings to convert between CFUUID and NSUUID, if needed. Two NSUUID objects are not guaranteed to be comparable by pointer value (as CFUUIDRef is); use isEqual: to compare two NSUUID instances.

6

Swift version of Raptor's answer:

let uuid = NSUUID().UUIDString
6
+ (NSString *)uniqueFileName
{
    CFUUIDRef theUniqueString = CFUUIDCreate(NULL);
    CFStringRef string = CFUUIDCreateString(NULL, theUniqueString);
    CFRelease(theUniqueString);
    return [(NSString *)string autorelease];
}
  • You really shouldn't just leave code without explanation, no matter how straightforward it is – Sirens Jun 4 '14 at 17:26
  • Errr, not sure why you selected my particular reply to comment on a year and a half later XD. – Bergasms Jun 5 '14 at 1:23
  • I didn't realize it was 1.5 years old.. Oh well, it does work nicely though.. :) – Sirens Jun 5 '14 at 2:54
3
-(NSString*) myUUID()
{
    CFUUIDRef newUniqueID = CFUUIDCreate(kCFAllocatorDefault);
    CFStringRef newUniqueIDString = CFUUIDCreateString(kCFAllocatorDefault, newUniqueID);
    NSString *guid = (__bridge NSString *)newUniqueIDString;
    CFRelease(newUniqueIDString);
    CFRelease(newUniqueID);
    return([guid lowercaseString]);
}
2

I suggest you to check this library: https://github.com/fabiocaccamo/FCUUID

It provides very simple API to get universally unique identifiers with different persistency levels.

It is compatible with: iOS5, iOS6, iOS7, iOS8

1

you can use CFUUID for iOS 5 or lower version and NSUUID for iOS 6 and 7. for making it more secure you can store your UUID in keychain

0
- (NSString*)generateGUID{
    CFUUIDRef theUUID = CFUUIDCreate(NULL);
    CFStringRef string = CFUUIDCreateString(NULL, theUUID);
    CFRelease(theUUID);
    return [NSString stringWithFormat:@"%@", string];
}
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