Print Preview for PDF in iOS [closed]

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I want to create an application where in I can display "print preview" on a PDF file. For example, if I set the N-up option to 4, 4 pages of the pdf will be displayed in page 1, etc.

I wanted to create something similar with the print preview of PrinterShare app.

An idea that I have in mind:
1) Read pdf (like an image), then draw the changes manually, e.g. if N-up, draw the image 4 times in a page while considering the new height/width (in this case, height and width will be set to 1/4 of original).

Do you have other ideas?
Or do you know of any libraries for "print previews"?

Any help will be greatly appreciated!

Answer 1

Your idea seems possible. For each option you want to consider, you can translate it to PDF drawing code.

For example, N-up can be done by scaling the previous PDF, and then redrawing it N times on the same page.
Margin can be done by changing your starting positions when drawing the PDF.

You can follow this guide for drawing to a PDF: https://developer.apple.com/library/ios/documentation/2ddrawing/conceptual/drawingprintingios/GeneratingPDF/GeneratingPDF.html

You can also refer to the following stackoverflow question: Convert a PDF to one page PDF reason for this is PDF pages doesnot have same page height
It has sample codes for drawing PDF.