import React from 'react';
import { RefreshControl, SafeAreaView, ScrollView, StyleSheet, Text } from 'react-native';
const wait = (timeout) => {
return new Promise(resolve => setTimeout(resolve, timeout));
}
const App = () => {
const [refreshing, setRefreshing] = React.useState(false);
const onRefresh = React.useCallback(() => {
setRefreshing(true);
wait(2000).then(() => setRefreshing(false));
}, []);
return (
<SafeAreaView style={styles.container}>
<ScrollView
contentContainerStyle={styles.scrollView}
refreshControl={
<RefreshControl
refreshing={refreshing}
onRefresh={onRefresh}
/>
}
>
<Text>Pull down to see RefreshControl indicator</Text>
</ScrollView>
</SafeAreaView>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
},
scrollView: {
flex: 1,
backgroundColor: 'pink',
alignItems: 'center',
justifyContent: 'center',
},
});
export default App;
import React from 'react';
import { SafeAreaView, View, FlatList, StyleSheet, Text, StatusBar } from 'react-native';
const DATA = [
{
id: 'bd7acbea-c1b1-46c2-aed5-3ad53abb28ba',
title: 'First Item',
},
{
id: '3ac68afc-c605-48d3-a4f8-fbd91aa97f63',
title: 'Second Item',
},
{
id: '58694a0f-3da1-471f-bd96-145571e29d72',
title: 'Third Item',
},
];
const Item = ({ title }) => (
<View style={styles.item}>
<Text style={styles.title}>{title}</Text>
</View>
);
const App = () => {
const renderItem = ({ item }) => (
<Item title={item.title} />
);
return (
<SafeAreaView style={styles.container}>
<FlatList
data={DATA}
renderItem={renderItem}
keyExtractor={item => item.id}
/>
</SafeAreaView>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
marginTop: StatusBar.currentHeight || 0,
},
item: {
backgroundColor: '#f9c2ff',
padding: 20,
marginVertical: 8,
marginHorizontal: 16,
},
title: {
fontSize: 32,
},
});
export default App;
1.Set-up
2.Fetcher
정리하자면...
- fetch operation을 useQuery 훅의 인자로 넘겨준다.
- useQuery 훅이 fetch operation을 추적한다.
- fetch가 찾은 데이터, 발생한 error, 현재 loading 여부의 정보들을 우리에게 전달해준다.
3.Caching
4.Query Disable Option
const {isLoading, data, refetch} = useQuery(["