storing data on iOS device using react native - ios

Question

I am new to React Native and trying to create a simple iOS app. The app has a button on clicking which I need to store the timestamp of the click on the device in a file.
I know that React Native has an API called AsyncStorage but I am getting errors while using this. I copied the code from some site on the net.
Can someone please guide me to use this API?
This is my entire code:
import React, {Component} from 'react';
import { StyleSheet, Text, View, TextInput, AsyncStorage } from 'react-native';
export default class App extends Component{
state = {
'name': ''
}
componentDidMount = () => AsyncStorage.getItem('name').then((value) => this.setState({'name': value}))
setName = (value) => {
AsyncStorage.setItem('name': value);
this.setState({'name': value});
}
render() {
return (
<View style={styles.container}>
<TextInput style = {styles.textInput} autoCapitalize = 'none'
onChangeText = {this.setName}/>
<Text>
{this.state.name}
</Text>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
alignItems: 'center',
marginTop: 50
},
textInput: {
margin: 15,
height: 35,
borderWidth: 1,
backgroundColor: '#7685ed'
}
});
As for the error, when I launch the code on iOS, I am getting a red screen. There is no syntax error that I can see.
Thanks in advance.

Answer 1

Hard to say without more detail the exact problem you're facing, but I assume some of the following might help you?
Ah I see you posted some code. You will need a constructor that defines your state as well. Added it in my code below.
Please note I'm not an expert. Forgive any errors
import {
AsyncStorage,
} from 'react-native';
class myComponent extends React.Component{
constructor(props) {
super(props);
this.state = {
data: null
};
}
componentDidMount() {
this._loadInitialState().done();
}
_someFunction() {
var myData = 123;
saveItemLocally('data', myData);
}
async _loadInitialState() {
try {
// get localy stored data
var dataStored = await AsyncStorage.getItem('data');
if (dataStored!==null) {
this.setState({
data: dataStored
});
}
} catch (error) {
//didn't get locally stored data
console.log(error.message);
}
} // end _loadinitialstate
render () {
//your render function
return (
);
}
} // end of your component
async function saveItemLocally(item, value) {
try {
await AsyncStorage.setItem(item, value);
} catch (error) {
console.log('AsyncStorage error: ' + error.message);
}
}