how to synchronize contact list in ios application

I am new to XOJO ios app development and want to create a ios application in xojo. i need help to synchronize phone list in my ios application. I just want to list complete phone list from the phone when i click on a button.
so please give me suggestions to do so.

This might help: https://www.monkeybreadsoftware.de/xojo/AddressBookKit/