Edit

AccessibilityInfo

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.

Example

• Function Component Example
• Class Component Example

import React, { useState, useEffect } from "react";
import { AccessibilityInfo, View, Text, StyleSheet } from "react-native";

const App = () => {
  const [reduceMotionEnabled, setReduceMotionEnabled] = useState(false);
  const [screenReaderEnabled, setScreenReaderEnabled] = useState(false);

  useEffect(() => {
    AccessibilityInfo.addEventListener(
      "reduceMotionChanged",
      handleReduceMotionToggled
    );
    AccessibilityInfo.addEventListener(
      "screenReaderChanged",
      handleScreenReaderToggled
    );

    AccessibilityInfo.isReduceMotionEnabled().then(
      reduceMotionEnabled => {
        setReduceMotionEnabled(reduceMotionEnabled);
      }
    );
    AccessibilityInfo.isScreenReaderEnabled().then(
      screenReaderEnabled => {
        setScreenReaderEnabled(screenReaderEnabled);
      }
    );

    return () => {
      AccessibilityInfo.removeEventListener(
        "reduceMotionChanged",
        handleReduceMotionToggled
      );
      AccessibilityInfo.removeEventListener(
        "screenReaderChanged",
        handleScreenReaderToggled
      );
    };
  }, []);

  const handleReduceMotionToggled = reduceMotionEnabled => {
    setReduceMotionEnabled(reduceMotionEnabled);
  };

  const handleScreenReaderToggled = screenReaderEnabled => {
    setScreenReaderEnabled(screenReaderEnabled);
  };

  return (
    <View style={styles.container}>
      <Text style={styles.status}>
        The reduce motion is {reduceMotionEnabled ? "enabled" : "disabled"}.
      </Text>
      <Text style={styles.status}>
        The screen reader is {screenReaderEnabled ? "enabled" : "disabled"}.
      </Text>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    alignItems: "center",
    justifyContent: "center"
  },
  status: {
    margin: 30
  }
});

export default App;

import React, { Component } from 'react';
import { AccessibilityInfo, View, Text, StyleSheet } from 'react-native';

class AccessibilityStatusExample extends Component {
  state = {
    reduceMotionEnabled: false,
    screenReaderEnabled: false,
  };

  componentDidMount() {
    AccessibilityInfo.addEventListener(
      'reduceMotionChanged',
      this._handleReduceMotionToggled
    );
    AccessibilityInfo.addEventListener(
      'screenReaderChanged',
      this._handleScreenReaderToggled
    );

    AccessibilityInfo.isReduceMotionEnabled().then(reduceMotionEnabled => {
      this.setState({ reduceMotionEnabled });
    });
    AccessibilityInfo.isScreenReaderEnabled().then(screenReaderEnabled => {
      this.setState({ screenReaderEnabled });
    });
  }

  componentWillUnmount() {
    AccessibilityInfo.removeEventListener(
      'reduceMotionChanged',
      this._handleReduceMotionToggled
    );

    AccessibilityInfo.removeEventListener(
      'screenReaderChanged',
      this._handleScreenReaderToggled
    );
  }

  _handleReduceMotionToggled = reduceMotionEnabled => {
    this.setState({ reduceMotionEnabled });
  };

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

  render() {
    return (
      <View style={this.styles.container}>
        <Text style={this.styles.status}>
          The reduce motion is{' '}
          {this.state.reduceMotionEnabled ? 'enabled' : 'disabled'}.
        </Text>
        <Text style={this.styles.status}>
          The screen reader is{' '}
          {this.state.screenReaderEnabled ? 'enabled' : 'disabled'}.
        </Text>
      </View>
    );
  }

  styles = StyleSheet.create({
    container: {
      flex: 1,
      alignItems: 'center',
      justifyContent: 'center',
    },
    status: {
      margin: 30,
    },
  });
}

export default AccessibilityStatusExample;

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Reference

Methods

isBoldTextEnabled()

static isBoldTextEnabled()

iOS-Only. Query whether a bold text is currently enabled. Returns a promise which resolves to a boolean. The result is true when bold text is enabled and false otherwise.

isGrayscaleEnabled()

static isGrayscaleEnabled()

iOS-Only. Query whether grayscale is currently enabled. Returns a promise which resolves to a boolean. The result is true when grayscale is enabled and false otherwise.

isInvertColorsEnabled()

static isInvertColorsEnabled()

iOS-Only. Query whether invert colors is currently enabled. Returns a promise which resolves to a boolean. The result is true when invert colors is enabled and false otherwise.

isReduceMotionEnabled()

static isReduceMotionEnabled()

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

isReduceTransparencyEnabled()

static isReduceTransparencyEnabled()

iOS-Only. Query whether reduce transparency is currently enabled. Returns a promise which resolves to a boolean. The result is true when a reduce transparency is enabled and false otherwise.

isScreenReaderEnabled()

static isScreenReaderEnabled()

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.

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addEventListener()

static addEventListener(eventName, handler)

Add an event handler. Supported events:

• boldTextChanged: iOS-only event. Fires when the state of the bold text toggle changes. The argument to the event handler is a boolean. The boolean is true when bold text is enabled and false otherwise.
• grayscaleChanged: iOS-only event. Fires when the state of the gray scale toggle changes. The argument to the event handler is a boolean. The boolean is true when a gray scale is enabled and false otherwise.
• invertColorsChanged: iOS-only event. Fires when the state of the invert colors toggle changes. The argument to the event handler is a boolean. The boolean is true when invert colors is enabled and false otherwise.
• reduceMotionChanged: Fires when the state of the reduce motion toggle changes. The argument to the event handler is a boolean. The boolean is true when a reduce motion is enabled (or when "Transition Animation Scale" in "Developer options" is "Animation off") and false otherwise.
• screenReaderChanged: 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.
• reduceTransparencyChanged: iOS-only event. Fires when the state of the reduce transparency toggle changes. The argument to the event handler is a boolean. The boolean is true when reduce transparency is enabled and false otherwise.
• announcementFinished: iOS-only event. 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.

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setAccessibilityFocus()

static setAccessibilityFocus(reactTag)

Set accessibility focus to a React component. On Android, this calls UIManager.sendAccessibilityEvent(reactTag, UIManager.AccessibilityEventTypes.typeViewFocused);.

Note: Make sure that any View you want to receive the accessibility focus has accessible={true}.

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announceForAccessibility()

static announceForAccessibility(announcement)

Post a string to be announced by the screen reader.

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removeEventListener()

static removeEventListener(eventName, handler)

Remove an event handler.