react-native/docs/accessibilityinfo.md

id	title	layout	category	permalink	next	previous
accessibilityinfo	AccessibilityInfo	docs	APIs	docs/accessibilityinfo.html	actionsheetios	webview

Sometimes it's useful to know whether or not the device has a screen reader that is currently active. The AccessibilityInfo API is designed for this purpose. You can use it to query the current state of the screen reader as well as to register to be notified when the state of the screen reader changes.

Here's a small example illustrating how to use AccessibilityInfo:

class ScreenReaderStatusExample extends React.Component {
  state = {
    screenReaderEnabled: false,
  }

  componentDidMount() {
    AccessibilityInfo.addEventListener(
      'change',
      this._handleScreenReaderToggled
    );
    AccessibilityInfo.fetch().done((isEnabled) => {
      this.setState({
        screenReaderEnabled: isEnabled
      });
    });
  }

  componentWillUnmount() {
    AccessibilityInfo.removeEventListener(
      'change',
      this._handleScreenReaderToggled
    );
  }

  _handleScreenReaderToggled = (isEnabled) => {
    this.setState({
      screenReaderEnabled: isEnabled,
    });
  }

  render() {
    return (
      <View>
        <Text>
          The screen reader is {this.state.screenReaderEnabled ? 'enabled' : 'disabled'}.
        </Text>
      </View>
    );
  }
}

Methods

• fetch
• addEventListener
• setAccessibilityFocus
• announceForAccessibility
• removeEventListener

---

Reference

Methods

fetch()

AccessibilityInfo.fetch(): Promise

Query whether a screen reader is currently enabled. Returns a promise which resolves to a boolean. The result is true when a screen reader is enabled and false otherwise.

---

addEventListener()

AccessibilityInfo.addEventListener(eventName: ChangeEventName, handler: Function): Object

Add an event handler. See Change Event Names.

---

setAccessibilityFocus()

AccessibilityInfo.setAccessibilityFocus(reactTag: number): void

Set accessibility focus to a React component.

Platform
iOS

---

announceForAccessibility()

AccessibilityInfo.announceForAccessibility(announcement: string): void

Post a string to be announced by the screen reader.

Platform
iOS

---

removeEventListener()

AccessibilityInfo.removeEventListener(eventName: ChangeEventName, handler)

Remove an event handler. See Change Event Names.

Change Event Names

change

Fires when the state of the screen reader changes. The argument to the event handler is a boolean. The boolean is true when a screen reader is enabled and false otherwise.

announcementFinished

Fires when the screen reader has finished making an announcement. The argument to the event handler is a dictionary with these keys:

• announcement: The string announced by the screen reader.
• success: A boolean indicating whether the announcement was successfully made.

Platform
iOS