Display previous and next buttons when Voice Over is activated

[mpospese]

Blind users won't easily be able to pan or swipe the carousel. When VoiceOver is activated, let's display previous and next buttons.

• use SF Symbols (perhaps arrow in circle)
• 44 x 44 point tap target
• anchored to leading and trailing edges of screen
• disabled when on first/last page as appropriate
• Need localized accessibility text: "Previous" and "Next"

[mpospese]

@WestonHanners could you please review this issue and see if it makes sense? (And if it does not make sense, please suggest an alternative to improve the carousel's A11y support.)

[WestonHanners]

I am not really seeing a need for back and next buttons as long as...

1. Users can swipe through using 3 fingers.

2. We add accessibility hints to indicate page.

3. We advise host applications to properly use heading landmarks so users can jump around easily.

4. (optional) use the Page control at the bottom with page x of y and hints to swipe.

I was unable to find a use case for an unusable carousel where it would have been improved with back and next buttons.