Question

We’re currently using PhoneGap for our mobile applications, and I know they have device.udid (http://docs.phonegap.com/en/1.0.0/phonegap_device_device.md.html#device.uuid) to get unique identifiers. What’s the best way to future-proof so that our current applications will work when iOS 6 comes out? Should we start using some of the other solutions out there (MAC address, etc.) to ensure future-compatibility?

Answer 1

Check out the documentation for CFUUIDCreate

https://developer.apple.com/library/mac/#documentation/CoreFoundation/Reference/CFUUIDRef/Reference/reference.html

I use the method below to create a UUID and save it to the user preferences the first time the app is started:

- (NSString *)getUUID
{
    NSString *UUID = [[NSUserDefaults standardUserDefaults] objectForKey:@"uniqueID"];
    if (!UUID)
    {
        CFUUIDRef theUUID = CFUUIDCreate(NULL);
        CFStringRef string = CFUUIDCreateString(NULL, theUUID);
        CFRelease(theUUID);
        UUID = [(__bridge NSString*)string stringByReplacingOccurrencesOfString:@"-"withString:@""];
        [[NSUserDefaults standardUserDefaults] setValue:UUID forKey:@"uniqueID"];
    }
    return UUID;
}