react-native-page-indicator

React Native Page Indicator

React Native component to display the current page of a swiper, slideshow, carousel etc. The package has zero dependencies and uses React Native's Animated API with native driver to produce silky-smooth animations.

Horizontal	Vertical

Installation

yarn add react-native-page-indicator
# or
npm install react-native-page-indicator

Basic example

Pass the total number of pages in the count prop and the current page index in the current prop.

import React from 'react';
import { View, StyleSheet } from 'react-native';
import { PageIndicator } from 'react-native-page-indicator';

const MyComponent = ({ pages, current }) => (
  <View style={styles.wrapper}>
    <PageIndicator count={pages} current={current} />
  </View>
);

const styles = StyleSheet.create({
  wrapper: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
  },
});

export default MyComponent;

Advanced example

For a more appealing experience when the indicator directly responds to scroll position, you should pass the current page index of Animated.Value type to animatedCurrent prop. The simplest way to obtain the value is to divide scroll position by the page width (for horizontal scrolling) or page height (for vertical scrolling).

import React, { useRef } from 'react';
import { Animated, StyleSheet, Text, View, useWindowDimensions } from 'react-native';
import { PageIndicator } from 'react-native-page-indicator';

const pages = ['Page 1', 'Page 2', 'Page 3'];

const App = () => {
  const { width, height } = useWindowDimensions();
  const scrollX = useRef(new Animated.Value(0)).current;

  return (
    <View style={styles.root}>
      <Animated.ScrollView
        horizontal={true}
        pagingEnabled={true}
        showsHorizontalScrollIndicator={false}
        onScroll={Animated.event([{ nativeEvent: { contentOffset: { x: scrollX } } }], {
          useNativeDriver: true,
        })}
      >
        {pages.map((page, index) => (
          <View key={index} style={[styles.page, { width, height }]}>
            <Text>{page}</Text>
          </View>
        ))}
      </Animated.ScrollView>
      <PageIndicator
        style={styles.pageIndicator}
        count={pages.length}
        animatedCurrent={Animated.divide(scrollX, width)}
      />
    </View>
  );
};

const styles = StyleSheet.create({
  root: {
    flex: 1,
  },
  page: {
    alignItems: 'center',
    justifyContent: 'center',
  },
  pageIndicator: {
    left: 0,
    right: 0,
    bottom: 50,
    position: 'absolute',
  },
});

export default App;

Props

Prop	Type	Default	Description
count	number		The total number of pages (required)
current	number	0	The current page index
color	string	black	Color of the indicators
activeColor	string		Optional color of the active indicator
size	number	6	Size of the indicators
gap	number	6	Distance between the indicators
opacity	number	0.6	Opacity of inactive indicators
stroke	number	size * 4	Length of the active indicator stroke
borderRadius	number	size / 2	Border radius of the indicators
vertical	boolean	false	When true the indicators will be stacked vertically
duration	number	500	Duration of the animation (has no effect when animatedCurrent provided)
easing	EasingFunction	Easing.out(Easing.cubic)	Easing function, see available options
animatedCurrent	Animated.Value		Animated current page index
style	ViewStyle		Style object applied to the wrapping View

License

MIT