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App.js
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App.js
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/**
* Sample React Native App
* https://github.com/facebook/react-native
*
* @format
* @flow strict-local
*/
import React, {useState, useEffect} from 'react';
import {
FlatList,
SafeAreaView,
StatusBar,
StyleSheet,
Text,
useColorScheme,
View,
} from 'react-native';
import {Colors} from 'react-native/Libraries/NewAppScreen';
import MessageQueue from 'react-native/Libraries/BatchedBridge/MessageQueue';
import type {Node} from 'react';
const renderItem = item => {
return (
<View
style={{
height: 80,
backgroundColor: item.item % 2 == 0 ? 'red' : 'green',
justifyContent: 'center',
alignItems: 'center',
}}>
<Text style={{fontSize: 20, fontWeight: 'bold'}}>index{item.index}</Text>
</View>
);
};
const App: () => Node = () => {
const isDarkMode = useColorScheme() === 'dark';
const backgroundStyle = {
backgroundColor: isDarkMode ? Colors.darker : Colors.lighter,
};
const [data, setData] = useState([]);
const [refreshing, setRefreshing] = useState(false);
useEffect(() => {
refreshData();
MessageQueue.spy(true);
}, []);
const refreshData = () => {
setRefreshing(true);
let arr = [];
for (let i = 0; i < 20; i++) {
arr.push(i);
}
setData(arr);
setRefreshing(false);
};
const loadData = () => {
let arr = [];
for (let i = 0; i < 20; i++) {
arr.push(i);
}
setData(data.concat(arr));
};
return (
<SafeAreaView style={backgroundStyle}>
<StatusBar barStyle={isDarkMode ? 'light-content' : 'dark-content'} />
<FlatList
data={data}
keyExtractor={(item, index) => index.toString()}
refreshing={refreshing}
renderItem={renderItem}
onRefresh={refreshData}
ItemSeparatorComponent={() => (
<View style={{backgroundColor: 'gray', height: 1}} />
)}
onEndReachedThreshold={0.5}
onEndReached={loadData}
/>
</SafeAreaView>
);
};
const styles = StyleSheet.create({
sectionContainer: {
marginTop: 32,
paddingHorizontal: 24,
},
sectionTitle: {
fontSize: 24,
fontWeight: '600',
},
sectionDescription: {
marginTop: 8,
fontSize: 18,
fontWeight: '400',
},
highlight: {
fontWeight: '700',
},
});
export default App;