Composer callback data (iOS)


I understand we get a callback with TwitterComposer

composer.showWithCompletion { (result) -> Void in
    if (result == TWTRComposerResult.Cancelled) {
        println("Tweet composition cancelled")
    else {
        println("Sending tweet!")

but is this just a button callback or a server callback? I’d like to get the Tweet Object or at least a tweet ID as a result. Do I have to use the REST Api instead to get the proper response object?