c4gd4s / pdfsignature-master

PDFSignature

Add a signature to a PDF using PDFKit in Swift Improvement needed: The signature must be adjustable i mean it must be draggable to sign anywhere on the PDF

pdfsignature-master's Issues

Crash when using pdfDocument.dataRepresentation().

Hi,
I referenced this repo to add the signature feature in my PDF reader. But I found a bug when I add image annotation on PDFDocument.
Take a scenario: a large PDF document was loaded in the memory and we need to save the document in repeating time. If use pdfDocument writeTo(url:) directly, the screen will blink which will give user a bad experience. So I used the background thread to save. The crash happened on that time, when use dataPresentation, it will work on sub-thread but not main thread, so the work thread cannot access the image(UIImage) of ImageStampAnnotation.

My solution on solving the issue on access UIImage is to use CG to draw the image to mock the UIImage, which is not a good solution and not suitable for signature.

In the other hands, I think may we should insert the image into the pdfDocument.data using UIGraphicPDFContext API to insert the signature image to the document which won't be modified after user making sure.

So, can you help me to figure this issue out? Thanks.