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PersistControl.js
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PersistControl.js
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import React, { useEffect, useState } from 'react'
import { Text, AsyncStorage } from 'react-native';
import { connect } from 'react-redux';
import { setPersonalSetting } from './actions'
const PersistControl = ({ dispatch, onSetPersonalSetting, personalSettings }) => {
const [mode, setMode] = useState('initial');
const effect = async () => {
if (mode === 'initial') {
const personalSettings0 = await getItem('personalSettings', {});
for (let key in personalSettings0) {
onSetPersonalSetting(key, personalSettings0[key]);
}
setMode('done');
}
else if (mode === 'done') {
setMode('syncing');
await setItem('personalSettings', personalSettings);
await sleepMsec(3000);
setMode('done');
}
}
useEffect(() => { effect() });
return <Text />
}
function sleepMsec(ms) {
return new Promise(resolve => setTimeout(resolve, ms));
}
async function getItem(key, defaultValue) {
try {
const a = await AsyncStorage.getItem(key);
return JSON.parse(a);
}
catch (err) {
return defaultValue;
}
}
async function setItem(key, value) {
await AsyncStorage.setItem(key, JSON.stringify(value));
}
const mapStateToProps = state => ({
personalSettings: state.personalSettings
})
const mapDispatchToProps = dispatch => ({
dispatch,
onSetPersonalSetting: (key, value) => dispatch(setPersonalSetting(key, value))
})
export default connect(
mapStateToProps,
mapDispatchToProps
)(PersistControl)