How to manage your PDF Pages using Foxit PDF SDK (Objective-C)

In PDF development, a PDF page means much more than in the final user’s PDF editor or viewer. Page objects help group and identify multiple objects in the PDF to perform other operations. A PDFPage object is retrieved from a PDF document by function PDFDoc.getPage. Page level APIs provide functions to parse, render, edit (includes creating, deleting and flattening) a page, retrieve PDF annotations, read and set the properties of a page, and more. For most cases, a PDF page needs to be parsed before it is rendered or processed.

In this article, we will provide sample code examples for handling your pages using Foxit PDF SDK:

Example:

How to get page size

#include "FSPDFObjC.h"...// Assuming FSPDFPage page has been loaded and parsed....float width = [page getWidth];float height = [page getHeight];...

How to calculate bounding box of page contents

#include "FSPDFObjC.h"...// Assuming FSPDFPage page has been loaded and parsed....FSRectF* content_box = [page calcContentBBox:FSPDFPageCalcContentsBox];

How to create a PDF page and set the size

#include "FSPDFObjC.h"...// Assuming FSPDFDoc doc has been loaded....float w = 612.0;float h = 792.0;FSPDFPage* page = [doc insertPage:index width:w height:h];

How to delete a PDF page

#include "FSPDFObjC.h"...// Assuming FSPDFDoc doc has been loaded.// Remove a PDF page by page index.[doc removePage:index];// Remove a specified PDF page.[doc removePageWithPDFPage:page];...

How to flatten a PDF page

#include "FSPDFObjC.h"...// Assuming FSPDFPage page has been loaded and parsed.// Flatten all contents of a PDF page.[page flatten:YES options:FSPDFPageFlattenAll];// Flatten a PDF page without annotations.[page flatten:YES options:FSPDFPageFlattenNoAnnot];// Flatten a PDF page without form controls.[page flatten:YES options:FSPDFPageFlattenNoFormControl];// Flatten a PDF page without annotations and form controls (Equals to nothing to be flattened).[page flatten:YES options:FSPDFPageFlattenNoAnnot|FSPDFPageFlattenNoFormControl];...

How to get and set page thumbnails in a PDF document

#include "FSPDFObjC.h"...// Assuming FSPDFPage page has been loaded and parsed.FSBitmap* thumbnail_bmp = [page loadThumbnail];