I have several apps published on the Apple Appstore. Four of them are using iAds and that service is going to be discontinued soon. I am going to switch them all to use Admob.
I started working on the first one. It is a pretty basic game that was built for us by a contracted developer. It has been a few years since it was originally created. I don't know if it was built poorly or the recommended ways of doing things have just changed since then, but it is not built in a way that works with the basic admob examples. They suggest that your app use a storyboard and this one does not.
It looks like I will have to create the adunit in code and add it to the view. I found a few examples of this on Stack Overflow but I haven't had time to try it yet.
I don't have the source code for 2 of the other apps yet, someone is going to send it to me, and the fourth one was built with a framework called Moai. That last one is going to take some time to get fixed. I have to setup a development environment for that framework and the framework isn't officially supported anymore from what I can tell.
I'll post more about all this soon I hope.