In a project I’m currently working on I needed to generate a PDF based on a bunch of information the user had entered. The PDF needed to be very fancy and have images and graphics all over the place to make it look really nice. Instead of drawing everything from scratch I used to some of the PDF libraries on iOS that allowed me to create a new PDF based on an existing one, then draw the dynamic content over the top. This even preserves the nice vectors and crisp text inside the original so it remains perfect when printing. This saved me a lot of time and kept the PDF exactly how the client wanted it.