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];