Font scaling

nnovalbos 371

Hi,

How can I avoid system font scaling when, for accessibility, the font has been scaled.

Thank you

Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 43,446 Reputation points Microsoft Vendor

2022-04-26T06:00:00.65+00:00

Did you mean how to prevent Fontsize scaling in the Xamarin Application after system FontSize changing?

In any case, the Application shouldn't override the user's Accessibility settings, because it will break security or a11y.

Could you please tell us why you want to implement this function?

It will be helpful for us to find a better way to resolve your issue.
nnovalbos 371 Reputation points

2022-04-26T10:54:25.64+00:00

Hi @Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) ,

Thanks for answering.

When copying the code the compiler shows errors.
Does not recognize 'Resources'
Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 43,446 Reputation points Microsoft Vendor

2022-04-27T01:03:21.04+00:00

Resources is in Android.Content.Res namespace.
nnovalbos 371 Reputation points

2022-04-27T14:27:32.777+00:00
Thanks for the information, on Android I already have it.

Now I am having a problem on ios.

I add, as the documentation says, these lines in the App.xaml

xmlns:ios="clr-namespace:Xamarin.Forms.PlatformConfiguration.iOSSpecific;assembly=Xamarin.Forms.Core" ios:Application.EnableAccessibilityScalingForNamedFontSizes="false"

But it gives me problems. From the tests I've done it seems that it doesn't 'like' having the font size defined in a style.

Do you know if something extra has to be done if styles are used?

Thank you
Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 43,446 Reputation points Microsoft Vendor

2022-04-28T06:16:07.377+00:00

In iOS, you can use the following code in your App code behind before you initialise your pages:

Xamarin.Forms.Application.Current.On<iOS>().SetEnableAccessibilityScalingForNamedFontSizes(false);

Repeat, In any case, the Application shouldn't override the user's Accessibility settings, because it will break security or a11y.

Could you please tell us why you want to implement this function?

It will be helpful for us to find a better way to resolve your issue.
nnovalbos 371 Reputation points

2022-04-29T10:06:22.447+00:00

when they put the font very large, the interface does not look very good. With this I want to buy time to be able to give the adequate support to the font scaling. The disabling will be temporary.

On the other hand, the same thing happens to me on iOS when I have the fonts in style files. Maybe it's a Xamarin.Forms bug. If I don't use the styles or set the numeric value to the font size in the styles file, it does disable scaling.

Thank you very much for your attention and suggestions.
Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 43,446 Reputation points Microsoft Vendor

2022-05-02T02:59:26.52+00:00

It's my pleasure.

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