React Native switch component explanation with examples

React-native switch :

Switch is available in both android and iOS. This component is mainly used to add one turn on/off feature in Mobile apps. React-native provides one switch component with a couple of different props. In this tutorial, we will learn how to use this component and its props.

Create a basic react-native project :

Create one basic react-native project using npx react-native init SampleProgram. It will create one new react-native project in a folder SampleProgram. Open that folder, edit App.js as like below and run it on Android or iOS device/simulator/emulator :

import React from 'react';
import {
  SafeAreaView,
  StatusBar,
  Switch,
  StyleSheet,
  View
} from 'react-native';


const App = () => {
  return (
    <>
      <StatusBar barStyle="dark-content" />
      <SafeAreaView>
       <View style={styles.container}>
          <Switch />
       </View>
      </SafeAreaView>
    </>
  );
};

const styles = StyleSheet.create({
  container: {
    alignItems: "center",
    justifyContent: "center"
  }
});

export default App;

It will look like below :

react native switch

Here, you can see one switch on top. Try to click and activate it. It will not work. Because, by default, react-native doesn’t provide a clickable component.

We need to write custom code to make this work.

With the latest react-native version, you can use hook :

First of all, import useState :

import React, {useState} from 'react';

And write a toggle function :

const App = () => {
  const [switchState, setSwitchState] = useState(false);
  const toggleSwitch = () => setSwitchState(switchState => !switchState);

  return (
    <>
      <StatusBar barStyle="dark-content" />
      <SafeAreaView>
       <View style={styles.container}>
          <Switch value={switchState} onValueChange={toggleSwitch}/>
       </View>
      </SafeAreaView>
    </>
  );
};

That’s it. It will work. You can click on the switch to toggle.

Props :

We have used two props value and onValueChange props in the above example. React native provides a couple of different props to change different properties of a switch :

disabled :

true will disable the switch. The default value is false.

ios_backgroundColor :

It takes one color to set the background of the switch. This is available only for iOS.

onChange :

Function that invokes when the user tries to change the switch value. It receives an event.

thumbColor :

It is the color of the foreground color grip.

trackColor :

Custom color of the switch track.

value :

The value of the switch. Default false. true will turn it on.

onValueChange :

Function that invokes when the user changes the state of the switch. It receives a new value.

Where is the color and why codevscolor ?

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