Check Box

Success Criteria:

Name Name describes the purpose of the control and matches the visible label
Role Identifies itself as a Check box in Android and a Button in iOS
Grouping Visible label is grouped with the check box in a single swipe
State State options: disabled/dimmed, checked, not checked
Focus Focused by swipe or touch
Actions Double tap

External Keyboard Support

tab To focus
space bar Activates on iOS and Android
enter key Activates on Android

Native Element

  • 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

Actions

  • iOS
    • To activate: double tap
  • Android
    • To activate: double tap