Example usage of https://gist.github.com/anonymous/5644255

gistfile1.m

#pragma mark - State preservation

- (void)encodeRestorableStateWithCoder:(NSCoder*)coder
{
   [super encodeRestorableStateWithCoder:coder];

   // Preserve the managed objects
   NSData* data =
   [AManagedObjectArchiver ArchiveDataFromBlock:^(AManagedObjectArchiver* archiver)
    {
       [archiver encodeObject:self.rabbits forKey:@"rabbits"];
    }];
   [coder encodeObject:data forKey:@"rabbits"];
}

- (void)decodeRestorableStateWithCoder:(NSCoder*)coder
{
   [super decodeRestorableStateWithCoder:coder];

   // Restore the rabbits
   NSMutableData* data = [coder decodeObjectForKey:@"rabbits"];
   [AManagedObjectUnarchiver UnarchiveData:data
                                   Context:[NSManagedObjectContext MR_defaultContext]
                                     Block:^(AManagedObjectUnarchiver* unarchiver)
    {
       self.rabbits = [unarchiver decodeObjectForKey:@"rabbits"];
    }];
}