The .selected accessibility trait indicates when an element has been selected. You’ll notice that VoiceOver announces “selected” before the accessibility label. You can find that in the system for the selected tab in the tab bar, for example.
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Accessibility labels are not just for VoiceOver. If you tweak how they sound by changing spelling, adding spaces, etc. you could be making the experience worse for Voice Control and Braille display users. Attributed accessibility labels can help.
With regular buttons from UIKit or SwiftUI, you are all set. With complex views, headings, or table/collection view cells that, when selected, bring the user somewhere else in the app or perform an action, you'll have to add the button trait.
Please, don't use accessibility labels as ids for your UI tests. It can completely ruin the experience for VoiceOver users. There is actually an accessibility identifier property that you can use instead to uniquely identify your UI elements.
Content © Daniel Devesa Derksen-Staats — Accessibility up to 11!
