Created
July 25, 2022 17:45
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React Native useEffect that takes effect only when app is in foreground
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| import { useEffect, useRef } from 'react'; | |
| import { AppState } from 'react-native'; | |
| /** | |
| * Accepts a function that contains imperative, possibly effectful code. | |
| * Same as useEffect but has not effect when app is in background | |
| * | |
| * If the depencies changes while being in background, the effect will be executed after the app is in foreground again | |
| * | |
| * @param {*} effect Imperative function that can return a cleanup function | |
| * @param {*} deps If present, effect will only activate if the values in the list change. | |
| */ | |
| const useEffectForegroundOnly = (effect, deps) => { | |
| const appState = useRef(AppState.currentState); | |
| const needRefresh = useRef(false); | |
| useEffect(() => { | |
| const subscription = AppState.addEventListener('change', nextAppState => { | |
| appState.current = nextAppState; | |
| if(nextAppState === 'active' && needRefresh.current) { | |
| effect(); | |
| needRefresh.current = false; | |
| } | |
| }); | |
| return () => subscription.remove(); | |
| }, []); | |
| useEffect(() => { | |
| if (appState.current === 'active') { | |
| effect(); | |
| needRefresh.current = false; | |
| } else { | |
| needRefresh.current = true; | |
| } | |
| }, deps); | |
| }; | |
| export default useEffectForegroundOnly; |
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