How to join Active Directory via LDAP on iOS 8.0+?

Question

iOS

There is a task for a connection through LDAP. I did not find good libraries, there are old ones in the search for 3-4 or more years ago. The libraries that are needed there are no longer in Xcode, as I understand it. AD from Windows Server. The library from Azure is not suitable (as I understand it), since AD ​​is not Azure. What do you think, is there a way? All you need to do is connect using the LDAP protocol.
I would not want to transfer this to the backend, and third-party backend services are paid + expensive, also not an option.