Saturday, 14 May, 2022 UTC


Summary

react-native-elastic-view
Custom pull to refresh Component
Note ❗
react-native-gesture-handler supported by Expo 44 has a bug which breaks fresh refresh
If you are using react-native-gesture-handler version below 2 please install react-native-elastic-view 1.1.0

Usage

Step 1

Installation

Use yarn
yarn add react-native-elastic-view
or npm
npm i -S react-native-elastic-view
Prerequisites
You are going to need to have react-native-reanimated v2 and react-native-gesture-handler installed in your project.
Step 2
import RefreshableWrapper from 'react-native-elastic-view';
Step 3
Create Animated List or regular View to use pull to refresh
const AnimatedFlatlist = Animated.createAnimatedComponent(FlatList);
You can disable default styles of loader container passing prop defaultAnimationEnabled={false}
Pass Reanimated sharedValue to get overdrag Y-Offset
const contentOffset = useSharedValue(0);
<RefreshableWrapper
  defaultAnimationEnabled={false}
  contentOffset={contentOffset}
  Loader={() => ({
    <YourAwsomeComponent />
  })}
  isLoading={isLoading}
  bounces
  hitslop={{left: -50}} // Add the gesture hitslop
  managedLoading   // Trigger loading animation on state change 
  onRefresh={() => {
    refreshHandler();
  }}
>
  <AnimatedFlatlist />
</RefreshableWrapper>
Example
import { StatusBar } from 'expo-status-bar';
import React, { useState } from 'react';
import { StyleSheet, Text, View, FlatList, Dimensions } from 'react-native';
import Animated from 'react-native-reanimated';
import RefreshableWrapper from 'react-native-elastic-view';
import LottieView from 'lottie-react-native';

const AnimatedFlatlist = Animated.createAnimatedComponent(FlatList);
const data = ['1', '2', '3', '4', '5', '6'];
const { width } = Dimensions.get('screen');

const EmptyComponent = (props) => {
  return (
    <View>
      <Text>LIST EMPTY COMPONENT</Text>
    </View>
  );
};
const ListItem = (props) => {
  return (
    <View style={{ height: 200 }}>
      <Text>LIST Item COMPONENT</Text>
      <Text> {props.item}</Text>
    </View>
  );
};

export default function App() {
  const [isLoading, setIsLoading] = useState(false);
  const [listData, setListData] = useState([]);

  const refreshSimulationHandler = () => {
    setListData([]);
    setIsLoading(true);
    setTimeout(async () => {
      setListData(data);
      setIsLoading(false);
    }, 1500);
  };

  return (
    <View style={styles.container}>
      <StatusBar style='auto' />
      <View style={styles.header} />
      <RefreshableWrapper
        contentOffset={contentOffset}
        Loader={() => <YourAwsomeComponent />}
        isLoading={isLoading}
        onRefresh={() => {
          refreshSimulationHandler();
        }}
        bounces
      >
        <AnimatedFlatlist
          data={listData}
          keyExtractor={(item) => item}
          renderItem={({ item }) => {
            return <ListItem item={item} />;
          }}
          style={styles.scrollList}
          contentContainerStyle={styles.contenContainer}
          showsVerticalScrollIndicator={false}
          scrollEventThrottle={16}
          ListEmptyComponent={() => <EmptyComponent />}
        />
      </RefreshableWrapper>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
  },
  header: { width, height: 100, backgroundColor: 'grey' },
  contenContainer: {
    paddingVertical: 10,
    paddingHorizontal: 16,
    paddingBottom: 100,
    alignItems: 'center',
  },
  lottie: {
    width: 50,
    height: 50,
  },
  scrollList: { width, paddingTop: 20 },
});
Tips
  • If you have gesture conflicts, you can use ‘hitslop’ to control the trigger timing. see here
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