Segmented Control / Tab

When I use	I see/hear
Tab	Focus visibly moves to the button
Arrow keys	Navigate through group
Spacebar	Activates the button on iOS and Android
Enter	Activates the button on Android

When I use	I hear
Swipe	Focus moves to the element, expresses its state, if applicable
Doubletap	Activates the button

Reads	I hear
Name	Purpose is clear and matches visible label
Role	Identifies as a button in iOS and "double tap to activate" in Android
Group	Visible label (if any) is grouped or associated with the button in a single swipe
State	Expresses its state (selected/disabled/dimmed)

Developer notes

A segmented control is a linear set of two or more segments, each of which functions as a mutually exclusive button

Name matches the inside tab text
iOS Options
- setTitle( ) method
- Set a label in Interface Builder in the Identity Inspector
- accessibilityLabel
- (accessibilityLabel overrides setTitle)
Android Options
- android:text XML attribute
- contentDescription
- (contentDescription overrides android:text)

Selected state is announced for the control in group that is focused
iOS Options
- Active: isEnabled property
- Disabled: UIAccessibilityTraitNotEnabled. Announcement: dimmed
- UIControlState or isSelected, UIAccessibilityTraitNotEnabled
- Selected: Announced as “selected”
- Not selected: Announced as “double tap to select” as hint
Android Options
- Active: android:enabled=true
- Disabled: android:enabled=false. Announcement: disabled
- setSelected
- Selected: Announced as “selected”

Only manage focus when needed. Primarily, let the device manage default focus.

Consider how focus should be managed between child elements and their parent views.

iOS Options
- accessibilityElementIsFocused
- isAccessibilityElement - Yes, if the element can respond to user input
- To move screen reader focus to newly revealed content: UIAccessibilityLayoutChangedNotification
- To NOT move focus, but announce new content: UIAccessibilityAnnouncementNotification
Android Options
- android:focusable=true
- android=clickable=true
- Implement an onClick( ) event handler for keyboard, not onTouch( )
- nextFocusDown
- nextFocusUp
- nextFocusRight
- nextFocusLeft
- accessibilityTraversalBefore (or after)
- To move screen reader focus to newly revealed content: Type_View_Focused
- To NOT move focus, but announce new content: accessibilityLiveRegion
- To hide controls: Important_For _Accessibility_NO