So they pretty much all are "er" classes. ¯\_(ツ)_/¯
I'm not ruling out that this is an illustration of the problem with classes ending in -er.
It's just the way you write iOS apps (at least, the original design way).
It's classic MVC. Most of the action happens in the controllers.
BTW: I totally agree that the best code I write, is the code I don't write.
I'm not ruling out that this is an illustration of the problem with classes ending in -er.