Enumerating over results from an asynchronous network call

I have a facade over an asynchronous network call—that also performs pagination, ie multiple network calls in order to handle very large result sets—along the lines of this but I now want to use it in a context where knowing when it's finished iterating is important (e.g in an NSOperation):

[enumerateFoosAtURL:URL usingBlock:^(id foo, BOOL *stop) {
  ...
} failure:^(NSError *error) {
  ...
}];

The simplest thing might be to add an extra block but that is so sucky I nearly vomited in my mouth just typing out the example below:

[enumerateFoosAtURL:URL usingBlock:^(id foo, BOOL *stop) {
  ...
} success:^{
  // we're done
} failure:^(NSError *error) {
  ...
}];

A less sucky option might be to indicate if there are more to come:

[enumerateFoosAtURL:URL usingBlock:^(id foo, BOOL more, BOOL *stop) {
  ...
  if (!more) {
    // we're done
  }
} failure:^(NSError *error) {
  ...
}];

Yet another option that I think I like the most might be to simply transform the semantics of the original into this:

[enumerateFoosAtURL:URL usingBlock:^(id foo, BOOL *stop) {
  ...
} finished:^(NSError *error) {
  if (error) {
    // an error occurred
  } else {
    // we're done
    ...
  }
}];

Thoughts?

harukizaemon/gist:3993004