CODEWITHSUNDEEP
iphoneiosios7
Sandeep Khade
Sandeep Khade

Reputation: 2833

Creating UUID and UDID in iOS 7

I want to create UUID, I have code below which can create UUID, how can I create UDID with multiple vendors same ID in iOS7?

+ (NSString*) stringWithNewUUID
{
    CFUUIDRef uuidObj = CFUUIDCreate(nil);
    NSString *newUUID = (NSString*)CFUUIDCreateString(nil, uuidObj);
    CFRelease(uuidObj);
    return newUUID;
}

Upvotes: 5

Views: 13333

Answers (5)

Sandeep Khade
Sandeep Khade

Reputation: 2833

I have created a vendor ID and then saved it with keychain, which I am retaining for next time using KeychainWrapper keychainStringFromMatchingIdentifier:...

Upvotes: 5

Josip B.
Josip B.

Reputation: 2464

I followed Sandeep Khade's answer and made following code using PDKeychainBindings. It's same as using NSUserDefaults but it keeps identifier in keychain which saves data even when application is deleted.

+ (NSString *)uniqueVendor {

    PDKeychainBindings *keychain = [PDKeychainBindings sharedKeychainBindings];
    NSString *uniqueIdentifier = [keychain objectForKey:kKeyVendor];

    if (!uniqueIdentifier || !uniqueIdentifier.length) {

        NSUUID *udid = [[UIDevice currentDevice] identifierForVendor];
        uniqueIdentifier = [udid UUIDString];
        [keychain setObject:uniqueIdentifier forKey:kKeyVendor];
    }

    return uniqueIdentifier;
}

Upvotes: 0

Arun_
Arun_

Reputation: 1826

This method returns random UUID in iOS 6 and above

[[UIDevice currentDevice]identifierForVendor]

Upvotes: 5

gavinb
gavinb

Reputation: 20048

The CFUUIDCreate function produces a version 4 UUID which is taken entirely from a pseudo-random number generator. There are no timestamps or MAC addresses embedded in this type of UUID. (That refers to the little-used version 1 flavour.) These are safe to use for nearly all applications.

Upvotes: 5

kamprath
kamprath

Reputation: 2308

The UUID that the code produces above does not have a recoverable time stamp in it. It's just a string that looks something like this: E1D87006-7CD0-4E28-9768-624DA92F75D6

Upvotes: 2

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