Crash on iphone while scrolling

Question

HiI am using iphone x to view pdf but while scrolling it is crashing. SwiftSyncfusionFlutterPdfViewerPlugin.swift:161: Fatal error: Unexpectedly found nil while unwrapping an Optional value* thread #1, queue = 'com.apple.main-thread', stop reason = Fatal error: Unexpectedly found nil while unwrapping an Optional value frame #0: 0x00000001856c53d4 libswiftCore.dylib`_swift_runtime_on_reportlibswiftCore.dylib`_swift_runtime_on_report:-> 0x1856c53d4 <+0>: retlibswiftCore.dylib`_swift_reportToDebugger: 0x1856c53d8 <+0>: b 0x1856c53d4 ; _swift_runtime_on_reportlibswiftCore.dylib`_swift_shouldReportFatalErrorsToDebugger: 0x1856c53dc <+0>: adrp x8, 451942 0x1856c53e0 <+4>: ldrb w0, [x8, #0xbc]Target 0: (Runner) stopped.

Dilli Babu Nandha Gopal · Answer

Hi Muhammed,Thank you for contacting Syncfusion support.We are analyzing the reported issue from our side. Kindly share with us the issue reproducing document and steps which will be helpful for us to provide you a prompt solution at the earliest. We will share the analysis details on 4 March 2022.Regards,Dilli babu.

Deepika Ravi · Answer

Hi Muhammed, 
 
We tried to reproduce the issue with provided details but couldn’t be reproduced on our end. Kindly share us the issue reproducing document and steps. This information will be helpful for us to provide you a prompt solution at the earliest. 
 
Regards, 
Deepika Ravi

Justin · Answer

I have a similar issue that I am not sure if it is related or not. This is flutter on MacOS.

syncfusion_pdfviewer_macos/SyncfusionFlutterPdfViewerPlugin.swift:93: Fatal error: Unexpectedly found nil while unwrapping an Optional value

This happens on MacOS. Steps to reproduce for my issue.

Display a pdf
Make application full screen or take out of full screen
App crashed with the above error.

The pertinent swift code is

let document = self.documentRepo[documentID]!!

in this function:

private func getPagesHeight( call: FlutterMethodCall, result: @escaping FlutterResult)

{

guard let argument = call.arguments else {return}

let documentID = argument as! String

let document = self.documentRepo[documentID]!!

let pageCount = NSNumber(value: document.numberOfPages)

var pagesHeight = Array<Double>()

for index in stride(from: 1,to: pageCount.intValue + 1, by: 1){

let page = document.page(at: Int(index))

var pageRect = page!.getBoxRect(.mediaBox)

if(page!.rotationAngle > 0)

{

let angle = CGFloat(page!.rotationAngle) * CGFloat.pi/180

pageRect = (pageRect.applying(CGAffineTransform(rotationAngle: angle)))

}

pagesHeight.append(Double(pageRect.height))

}

result(pagesHeight)

}

Deepika Ravi · Answer

Hi Justin,We are checking on the reported query and will update details on July 13,2022.Regards,Deepika R

Deepika Ravi · Answer

Hi Justin,Currently, we are setting up the
environment to check the reported issue and we will update the further details
on July 20, 2022.Regards,Deepika Ravi

Deepika Ravi · Answer

Hi Justin,We tried
to reproduce the reported issue with provided details, but when the application
is in full screen or exiting full screen, the PDF loads properly without any
crashes in our side. For your reference, we have prepared a simple sample
(along with the output screen record of the same) and it can be downloaded from
the following link,https://www.syncfusion.com/downloads/support/directtrac/general/ze/F~173293-135344067.zip
If you
still reproduce the reported issue in your use case, then kindly share the
modified issue reproducing in the sample and share the issue replicating video,
which will be helpful for us to provide a prompt solution at the earliest.Regards,Deepika
Ravi

Vera Spoettl Zeisberg · Answer

Hi,I have the same problem on MacOS. Unfortunately it appears quite sporadic so that I can't give steps to reproduce.I have an exandable list where the PDFViewer is part of the expansion tiles bodies. The problem seems to be connected with scrolling through the list. But as I mentioned ... it's sporadic and no predictable error. :-( I'll get back to this thread as soon as I managed to record or reproduce the error.Vera

Deepika Ravi · Answer

Hi Vera Spoettl Zeisberg ,We tried to reproduce the reported
issue with provided details, but the PDF loads properly without any crashes in
our side. For your reference, we have prepared a simple sample and it can be
downloaded from the attachment.If you still reproduce the
reported issue in your use case, then kindly share the modified issue
reproducing in the sample and share the issue replicating video, which will be
helpful for us to provide a prompt solution at the earliest.Regards,Deepika RAttachment: sample_4697ee2e.zip