Q:

Swift 4: Add pencil to sign PDF file

I try to add a pencil functionality to my NavigationController to add a customer sign in PDF file. At the moment, I'm able to create and show my own PDF file but not to sign it in my App.
In the files App, the pencil is shown at the right top corner. After selecting the pencil, I can sign the PDF file.

How can I achieve this for my own App?

A:

I solved my problem with the help of this tutorial.
The complete source code is available at this repo.

