Developer notes

  • A check box lets the user choose between two opposite states, actions or values
  • You should use a native component rather than custom, because it will announce the correct built-in screen reader output for free

Name

  • Name describes the purpose of the control
  • iOS Options
    • Set a label in Interface Builder in the Identity Inspector
    • Group visible text label and the control in the same view container: accessibilityFrameInContainerSpace
    • setTitle( ) method
    • If no visible label, use accessibilityLabel on control
    • Hint is used only if the results of interacting with it are not obvious from the control’s label.
    • Match visible label, if any
    • To hide labels from VoiceOver announcements, uncheck the Accessibility Enabled checkbox in the Identity Inspector
    • If hiding visible label, use accessibilityLabel on control
  • Android Options
    • android:text XML attribute
    • Optional: use contentDescription for a more descriptive name, depending on type of view and for elements without a visible label.
    • contentDescription overrides android:text
    • Use labelFor attribute to connect the visible label to the control

Role

  • iOS
    • NSSwitchButton
    • Announced as “button” or “checkbox”
  • Android
    • CheckBox Class
    • Announced as “checkbox”

Groupings

  • Group visible label with checkbox
  • iOS
    • accessibilityFrame
    • accessibilityFrameInContainerSpace
    • GroupView
  • Android
    • ViewGroup
    • Set the container object’s android:screenReaderFocusable attribute to true, and each inner object’s android:focusable attribute to false. In doing so, accessibility services can present the inner elements’ content descriptions/names, one after the other, in a single announcement.

State

  • iOS
    • UIControlState or isSelected, UIAccessibilityTraitNotEnabled
    • Selected: Announced as “checked”
    • Not selected: Announced as “not checked” as hint
    • Disabled: UIAccessibilityTraitNotEnabled. Announced as “dimmed”
  • Android
    • Active: android:enabled=true, isChecked, setChecked
    • Disabled: android:enabled=false. Announced as: “disabled”

Focus

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