I can see a lot of methods to get values, I can even nicely map out the entire PDF into a dictionary (see this thread).
But I could not find a way to write back into those dictionaries. I really just want to turn off a layer visibility. Just set a boolean to false at Catalog.Pages.Kids[pageIndex].Resources.Properties.MC(layerIndex).Visible, then save the PDF.
I can see that you can nicely read/write annotations (even with the higher-level PDFKit API).
But how do you edit the rest of the PDF contents (like above)?
Is it achievable at all with Apple PDFKit?
