getUUID

getUUID

+ (NSString *)getUUID
{
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    if ([defaults stringForKey:@"UUID"])
    {
        return [defaults stringForKey:@"UUID"];
    }
    else
    {
        CFUUIDRef theUUID = CFUUIDCreate(NULL);
        CFStringRef string = CFUUIDCreateString(NULL, theUUID);
        CFRelease(theUUID);
        [defaults setObject:(__bridge NSString *)string forKey:@"UUID"];
        return (__bridge NSString *)string;
    }
}