Google mobile ads (native) for iOS games

Hi, do you have some documents how to implement native ads in Xcode but using ObjectiveC or Swift for mobile game exported through Unity. What is the best way? If you have some projects, can you share them just to see implementation? The main problem is when I export game using Unity the whole concept of Xcode is different. I need to make "framework or pattern" for all games I want to export. Thanks in further!