I'm using WKWebView to load PDF files. I've found that all the annotations in the pdf are invisible.
Does anyone know how to fix this bug?
If you open the PDFs in Adobe Acrobat do the annotations display?
In a PDF 1.7 and earlier file, annotations are not required to have their appearance defined in the file and instead PDF viewing applications can generate them when the PDF is opened. Not all PDF viewing applications are capable of generating the appearance of all annotation types though (there are many different annotation types in PDF).
If Acrobat displays the annotations and WKWebview does not, then the annotations are most likely missing their appearances and Acrobat is generating them from what is stored in the PDF.
In PDF 2.0 (recently published as a standard), annotations are required to have a defined normal appearance so that PDF viewers do not have to generate the appearance any longer which will provide a much more consistent experience for those who are reading PDFs (it will be a while before this catches on though).
There are a number of tools out there that can be used to create the appearance for annotations and save them into the PDF so if you determine that the annotations are missing their appearances you can get one of those tools and run the PDFs through it before presenting them in your WKWebview.
Related
I know Mozilla PDF.js is used only for PDF viewer purpose. By using some open source codes like (annotations) I have created some highlight, underline and strikeout features over PDF viewer.
Now I want to implement the free text and callout features to be added on top of it. Also while performing an annotation I want to retrieve the co-ordinates of PDF where the annotation is added.
Any help would be appreciated.
I Searched out i can view PDF or any text file using QLPreviewController and WebView. I know both way how to display but i didn't get what is the main difference between them.
Any one Tell me the Difference between this two.?
The primary purpose of QLPreviewController is to preview local files. That's all it does. And it provides the ability to share the document.
WKWebView is for presenting web content and local files. It is a general web browser. It's primary purpose is for viewing web content. It lets you move back and forth through browsing history. It allows you to handle links.
If your app needs to allow a user to view and possibly share a local document, use QLPreviewController. If your app needs a browser, use a web view.
I am developing the app like ibooks by reference,in that the pdf is not enabling the menu i.e while I long tap the pdf it not showing Menu like copy , define.
How can I work in menu? Help me.
The linked solution simply does not implement text selection or glyph coordinate extraction/conversion. You need to parse the PDF page content stream and track glyphs on the page. CGPDFOperatorTable can be a starting point, however I suggest reading the PDF spec and getting familiar with the multiple transformation matrix states that a page can have - it's quite tricky to get right. You also need to embed various CMaps (character maps) so that all fonts can be correctly parsed. It took me more than a year to get a reliable text extraction for >99% of all PDF documents. If you want to save this time, you can check out the commercial PDF SDK I am working - google for PSPDFKit. We support iOS and Android.
How to play with the PDF document in ios?
I have to perform some operations on the PDF document like - read the PDF document, Adding annotations to PDF, making note on PDF, Search text in PDF, highlighting the text in PDF document.
How this can be achieved? Can anyone please suggest me a sdk or tutorial? (Except PDFKitten...)
I know it is old question but since iOS11 you can use PDFKit.
My upcoming mobile web project requires viewing dynamically chosen pdf files inside the webpage. I am using iFrame to display the pdf file and the file can be scrolled using two-finger scrolling. But the problems I am facing are:
The first page of the file is not displayed completely on the iPad and gets cut off along the width unlike when I view it on the desktop browsers where the first page of the pdf is always entirely displayed although zoomed out to fit in the iFrame area.
There is no visual indication for the users that the pdf document can be scrolled, i.e., there is no scroll bar on the pdf document.
The controls (page navigation, zoom etc.) for the pdf viewer (Adobe reader) don't appear on the document unlike when I see it on the desktop browsers.
What is the best way to achieve what I am trying to do? Do any of you experts know any solutions/workarounds to the problems I am facing? An entirely different approach using anything other than iFrame can also be considered.
The reason why the pdf should be inside the html page is that, the list of pdf files will be on a menu bar on the left side of the page and the user can click on any of them to view on the same page. Ideally, they will have the capability to toggle between full screen view and that view.
Any help is appreciated.
I created a tiny JavaScript module that helps you to show a PDF inline and be able to scroll it. But I also couldn't figure out a way to make it fit the total width of the parent container.
Check it out: https://github.com/williamrjribeiro/ipdf-scroll
Cheers.
I came across this Recommended way to embed PDF in HTML? while researching on the web to find an answer.
The mentioned link discusses about some options that I can use and the google document viewer works for me though don't know if there is anything (like data limit) I need to be aware of before using it on the website. Also I have no idea if it is a good solution (though the full screen mode is not available, but zoom-in/zoom-out and next/prev page buttons are there are show up in the mobile safari on the iPad) to use for an web app that will be run on the iPad.
Anyway, I will keep researching for a better solution and if i don't find any, I'll stick to the google document viewer.
The issue appears to be a bug with Safari on the IPad.
I didn't find a solution for embedding the pdf in html but I did find this:
If you return FileStreamResult from your controller action instead of a view, the pdf will open in a new tab, it's not embedded html but at least your user is not having to download files and open them manually.
I had the same problem of the pdf not being displayed completely. The only thing I found to fix this was the change the size of the div containing the pdf.
For example if the element containing the pdf is a div then I change its width to any value and the rollback to the value it had before. Changing Width or height any one works.
Sometimes I had to wait a little using a setTimeout before calling my resizable method