Last Updated: 19 Feb 2024 07:33 by ADMIN
Release 2023.3.1010
Created by: Manikandan
Comments: 0
Category: PdfViewer
Type: Bug Report
The values in the forms are not displayed in the document visualized from the viewer. 
Last Updated: 31 Jan 2024 09:06 by ADMIN
Release R2 2023
For some TrueType fonts, the spaces are displayed as rectangles.
Last Updated: 31 Jan 2024 09:01 by ADMIN
Release R3 2023
Some Image XObjects are imported but not displayed in PdfViewer.
Last Updated: 31 Jan 2024 09:00 by ADMIN
Release R3 2023
Some Image XObjects are imported but not displayed in PdfViewer.  This behavior usually occurs when the document contains scanned images.
Last Updated: 11 Dec 2023 11:48 by Dipayan

Text in specific pdf files is not visible in the viewer.

The text is not visualized due to the negative value for font size. 

Last Updated: 08 Jun 2023 09:05 by ADMIN
Release R2 2023
Paths in the documents are not visualized in the PdfViewer. 
Last Updated: 15 Feb 2022 09:59 by ADMIN

The linear gradient brush in not displayed on some elements.

On images the gradient is visualized.


Last Updated: 15 Nov 2021 11:10 by ADMIN

Zooming on physical devices does not work properly (gets stuck). Same behavior when scrolling and panning the document 


When trying to scroll, pan, and zoom, these gestures open the flyout menu, not to the document in the viewer.

Last Updated: 12 Oct 2021 12:29 by ADMIN
Some Shading elements are not property imported which leads to unexpected drawings on the exported (previewed in the PdfViewer) document.
Last Updated: 12 Oct 2021 10:09 by ADMIN
Release R3 2021
System.ArgumentException: Unsupported touch action type.
Parameter name: actionType
   at Telerik.XamarinForms.SkiaSharp.Interaction.SkiaViewInteractionAdapter.Convert(SKTouchAction actionType)
   at Telerik.XamarinForms.SkiaSharp.Interaction.SkiaViewInteractionAdapter.OnTouch(SKTouchEventArgs e)
   at Telerik.XamarinForms.SkiaSharp.Interaction.SkiaViewInteractionAdapter.GlView_Touch(Object sender, SKTouchEventArgs e)
   at SkiaSharp.Views.Forms.SKGLView.OnTouch(SKTouchEventArgs e)

is thrown when scrolling the document using the mouse wheel and using latest official SkiaSharp Views Forms version 2.80.3
Last Updated: 04 Oct 2021 13:31 by ADMIN
Release 2019.2.708 (R2 2019 minor release)

The pdf content is not visualized properly on UWP and iOS when the file is loaded from a stream. 

Also if you try to load PDF twice on the same PDF Viewer, an exception is raised.

Last Updated: 31 Aug 2021 14:02 by ADMIN
The glyphs are rendered with additional unexpected lines when a specific custom Type 1 font is used to show them.
Last Updated: 27 Aug 2021 09:10 by ADMIN

If you download the pdf document from the internet, save it to the device and try to show it inside PdfViewer, it will not be loaded on Xiaomi phones with MIUI 12.1. and above.

Users report similar issues with downloaded files on MIUI devices, here are a few discussions on the matter:

It seems that's the same reason for the PdfViewer not showing downloaded pdf files as it properly shows pdf documents added as embedded resource to the solution.

Last Updated: 11 May 2021 11:38 by ADMIN
Pdf document is not loaded when it contains Type1Font "middot" glyph.
Last Updated: 11 May 2021 11:37 by ADMIN
Exception is thrown when importing color with Lab colorspace
Last Updated: 08 Jan 2021 11:31 by ADMIN
Release R1 2021
Created by: StefanP
Comments: 0
Category: PdfViewer
Type: Bug Report
Even small documents containing images encoded with CCITTFaxDecode filter can take about 10 seconds to be opened.
Last Updated: 19 Nov 2020 13:20 by Chris

System.MissingFieldException: Field not found: Telerik.XamarinForms.SkiaSharp.SkiaDocumentView.purePainter Due to: Could not parse field signature 0a00031b due to: Could not resolve type with token 0100014e from typeref (expected class 'Telerik.XamarinForms.SkiaSharp.DocumentView.SkiaDocumentPurePainter' in assembly 'Telerik.XamarinForms.SkiaSharp, Version=2020.3.1106.460, Culture=neutral, PublicKeyToken=null') assembly:Telerik.XamarinForms.SkiaSharp, Version=2020.3.1106.460, Culture=neutral, PublicKeyToken=null type:Telerik.XamarinForms.SkiaSharp.DocumentView.SkiaDocumentPurePainter member:(null)
  at Telerik.XamarinForms.PdfViewer.RadPdfViewer.UpdatePresenter () [0x00037] in <bd15b7ab3df742a5908d5d151a9a58d8>:0
  at Telerik.XamarinForms.PdfViewer.RadPdfViewer..ctor () [0x00048] in <bd15b7ab3df742a5908d5d151a9a58d8>:0
  at OnaMobile.Views.PdfViewPage.InitializeComponent () [0x00012] in C:\Users\chris\Work\ONAMA\onama-mobile-app\OnaMobile\OnaMobile\obj\Debugetstandard2.0\Views\PdfViewPage.xaml.g.cs:22
  at OnaMobile.Views.PdfViewPage..ctor () [0x00008] in C:\Users\chris\Work\ONAMA\onama-mobile-app\OnaMobile\OnaMobile\Views\PdfViewPage.xaml.cs:19
  at OnaMobile.ViewModels.ResourcesPageViewModel.OpenResourceAsync (OnaMobile.OnlineResources.ResourceLink resource) [0x001ac] in C:\Users\chris\Work\ONAMA\onama-mobile-app\OnaMobile\OnaMobile\ViewModels\ResourcesPageViewModel.cs:186

iOS SDK 14.1, ARM64. Happens regardless of Linker Behavior setting.

The page itself has nothing in its code-behind other than the default constructor calling InitializeComponent(). In the XAML, the RadPdfViewer control is in a two-row, one-column grid, where it is in the second row:

<Grid VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand" ColumnSpacing="0" RowSpacing="0">
        <RowDefinition Height="60" />
        <RowDefinition Height="*" />

    <Frame Grid.Row="0"><!-- ... --></Frame>

    <pdf:RadPdfViewer Grid.Row="1" HorizontalOptions="Fill" VerticalOptions="FillAndExpand" Source="{Binding Source}" />
The view model has a DocumentSource property Source and implements INotifyPropertyChanged. However the exception occurs before the BindingContext of the page is set to the view model.
Last Updated: 30 Jun 2020 14:28 by ADMIN
KeyNotFoundException exception is thrown when the platform type is MacintoshNonSymbolic and the encoding is WinAnsiEncoding.
Last Updated: 24 Jun 2020 12:08 by ADMIN
Release R2 2020 SP
By specification, names are an atomic symbol uniquely defined by a sequence of characters. However, when importing a document with names defined as an empty sequence a handled InvalidCastException is thrown which leads to missing page content.
Last Updated: 30 Apr 2020 09:15 by ADMIN
Error message is: "One or more errors occurred. 
(Unable to cast object of type 'Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Types.PdfName' to type 'Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Types.PdfInt'.)"

The current implementation relies on valid cross-reference offsets in the PDF documents so that PDF objects are easily found and parsed. However, we may implement a mechanism for importing documents with invalid offsets for the objects inside the table.
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