Feature(iOS): Fonts are not scaled for a11y in nativescript.

Tell us about the problem

Platform font-size setting not respected by nativescript apps.

This is a huge problem for our target audience, which include the some who are only partially sighted.

Which platform(s) does your issue occur on?

iOS only. It works as expected on Android.

Please provide the following version numbers that your issue occurs with:

• CLI: 4.1x
• Cross-platform modules: 4.1.x, 4.0.x, 3.x.
• Runtime(s): 4.1.0
• Plugin(s): none

Please tell us how to recreate the issue in as much detail as possible.

Create a nativescript app and run it on iOS.

1. Go to Settings -> General -> Accessibility -> Larger text and change the font-size.
2. Go back to the nativescript app, the text is rendered the same size as before.

On iOS 10+ UILabel have the property adjustsFontForContentSizeCategory https://developer.apple.com/documentation/uikit/uicontentsizecategoryadjusting/1771731-adjustsfontforcontentsizecategor?language=objc

But my experience from solving this with our @nota/nativescript-accessibility-ext is that it only works for the preferred fonts on iOS and those are not easily set from NativeScript.

The way we solve it in @nota/nativescript-accessibility-ext is by listening for the platform setting and scaling the font-size, unfortunately this is slow and gives makes the UI jumpy.

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[m-abs]

@PatrickLohan You try use our (nota.dk) @nota/nativescript-accessibility-ext and the theme extensions, that’s what we do in our own app.

[PatrickLohan]

We use Nativescript-Vue and create a custom boolean prop (default true) that can be used in any text elements (labels/buttons etc.) that need to not have a11y settings.