Use PDFNet saving APIs from
PTPDFDoc class to save PDF documents on local storage.
To save a PDF document to path use
(void)SaveToFile:(NSString *)path flags:(unsigned int)flags:
[pdfDoc Lock]; [pdfDoc SaveToFile:docPath flags:0]; [pdfDoc Unlock];
There are a few ways to save a PDF document on permanent storage such as save with remove unused objects, save incrementally, and save in linearized format. To see complete list of saving modes check here.
This mode is optimized in terms of storage volume as it rearranges the PDF document and removes unused objects. As a result, the output file may be improved in terms of rendering too, although the saving process itself may take longer compared to other modes.
Use the incremental mode if you are concerned about saving time. If you use this mode, any changes to the document, even deleting annotations, will result in appending to the PDF file. Note that it is not possible to incrementally save the document if the underlying file has an XRef table that had to be repaired when the file was opened (see http://www.pdftron.com/kbcorruptxref).
The linearized format is preferred for file streaming, for example when you want to upload a PDF document.