Question

In your own app modifying the word completions from NNTextView is as simple as implementing textView:completions:forPartialWordRange:indexOfSelectedItem:

Is there any way to do tjis for other apps, that is replacing or augmenting the built-in word completion suggestions?

Answer 1

Yes, to some extent. You need to write a spell server. Once installed, you can select the default spell checker in the system preferences. For documentation, see Apple’s introduction and detailed references, e.g. for NSSpellServer.

However, I don’t think you can implement everything in your own spell server what Apple’s standard spell/grammar checker does; compare the list of methods NSSpellServer needs to implement, and methods NSSpellChecker has. Apple slowly adds to NSSpellServer the methods which correspond to those of NSSpellChecker… let’s hope Apple does this quickly.