I finished assignment 3 now, apart from the content scaling thing.
In course 9 the TableViewController was introduced. I added the instructions as given during the course. It all worked like a charm. I did however a few things a bit different: all buttons were added to the toolbar in the iPad storyboard.
Paul Hegarty was not able to all the relevant things in the course, so extra code was posted on the website. I folded all the posted code into my code. I used a slightly different approach to the iPhone storyboard: I added a toolbar at the bottom of the GraphView and put the formula, switch and add to favorites in there.
I am however left with one problem: the swipe gesture does not work. I still have to find a way to debug this. At the moment I am lost. It seems that the swipe-gesture is not recognized.