How to add predictive typing feature to custom keyboard?

Question

Objective-C

Good day!
Faced the following question. When developing a custom keyboard, it became necessary to add a predictive set. I searched for a long time and tediously, but Google broke down in my hands.
Has anyone faced a similar issue?

Answer 1

Maybe an auto-correct feature? It automatically turns on the predictive set, as I remember, but I could be wrong

textField.autoCorrectionType = UITextAutocorrectionTypeYES;

Answer 2

Google repair: "prev and active"