vn-verdnaturachat/app/views/RoomView/UnreadSeparator.js

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

const styles = StyleSheet.create({
	firstUnread: {
		flex: 1,
		flexDirection: 'row',
		alignItems: 'center',
		marginVertical: -7
	},
	firstUnreadLine: {
		borderTopColor: 'red',
		borderTopWidth: StyleSheet.hairlineWidth,
		flex: 1
	},
	firstUnreadBadge: {
		color: 'red',
		backgroundColor: '#fff',
		fontSize: 11,
		paddingHorizontal: 10,
		transform: [{ scaleY: -1 }]
	}
});

export default class UnreadSeparator extends React.PureComponent {
	componentWillUnmount() {
		LayoutAnimation.linear();
	}
	render() {
		return (
			<View style={styles.firstUnread}>
				<View style={styles.firstUnreadLine} />
				<Text style={styles.firstUnreadBadge}>unread messages</Text>
			</View>
		);
	}
}