How to find iOS's Show Lowercase Keys value

In the iOS system prefs->Accessibility->Keyboards, there's the switch for "Show Lowercase Keys", which allows keyboards to show upper- and lower-case key caps. I can't find any mention of an accessor for that value. It doesn't show in NSUserDefaults when I dump them, nor does any header mention it. I'd like to be able to use it in my custom keyboard extension.

Hey there, to my knowledge this preference is not available as API, to help get your feedback in our bug tracking system please file a request using Feedback Assistant https://developer.apple.com/bug-reporting/

Thanks!

That's too bad. I'll submit a bug.

Any chance the 2 settings in Sound & Haptics->Keyboard Feedback for Sound and Haptics are available to keyboard extensions?

How to find iOS's Show Lowercase Keys value
 
 
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