Ask HN: Where to find a well architectured open source iOS Application?

I recently started to work as an iOS Developer and so far I am only used to MVC. I also read about MVVM including coordinators and other more sophisticated stuff, but I still wonder how a well architectured iOS looks in real life. Is their a favorite iOS Application you would recommend to dive in? It would be nice if their are some views or view controllers included. And please don’t get me wrong. I am not asking for THE best architecture. I know that you have to be pragmatic some times.