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RGartman
Frequent Visitor

Change ActualZoom of PDF Viewer, or force it to load zoomed in? (changing zoom crashes on iOS)

I'm using the PDF Viewer in a app to be used on iPad.

 

As someone else found in 2017, changing the zoom of the PDF Viewer on iOS tends to crash the app and force it to restart. This happens whether using the built-in controls or making custom zoom controls.

 

As a workaround, I'd like to have the pdf be zoomed in by default, however even when changing the Zoom attribute, the PDF Viewer always loads to fit the width of the area.

 

Is there any way to force the PDF Viewer to start zoomed in, perhaps by modifying the ActualZoom attribute?

I don't see anywhere that ActualZoom can be modified.

6 REPLIES 6
v-monli-msft
Community Support
Community Support

Hi @RGartman ,

 

It seems that I have reproduced your issue. I will try to discuss this issue with others and see if they have further suggestions. Sorry for the inconvenience.

 

Regards,

Mona

Community Support Team _ Mona Li
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
denglish
Advocate II
Advocate II

@v-monli-msft-- Any update on this? In my app, the PdfViewer is still loading up set to Zoom.FitWidth, regardless of what the Zoom attribute is set to. Setting the Zoom attribute that changes OnVisible also does not work.

CoupalM
Advocate V
Advocate V

@v-monli-msft , same issue/requirement here. Any update?

Hey,

has anyone solved the problem ?

CoupalM
Advocate V
Advocate V

Hi, If I remember well, I needed to start a timer object when the apps is starting that sets a variable for the zoom level. The PDF viewer Zoom property is set to this variable. The idea is you need a duration of the timer object that is long enough for the PDF viewer to load the PDF and then set the zoom attribute. If the PDF is not loaded and you set the zoom, it will not work. 

 

Also, if you want to have zoom level default by user, you can use LoadData/SaveData to save and retreive user zoom level preference.

 

Hope this help.

Hey,

Here is a brief explanation of what I need. I have two screens in my app. On the first one, a PDF file is selected which is to be displayed on screen two. It is then displayed on screen 2. I have already tried your approach and set the AutoStart property of the timer to Set(varZoom, Zoom.FitBoth). I have set the zoom property of the PDF to varZoom. However, it does not work. Have I done something wrong or is there another approach that should work?

 

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