How are you. This is scenario of this issue. Let's say there are 2 screens to make it simple.
navigate back to A screen from B. at this time, useEffect is not called.
function CompanyComponent(props) {
const [roleID, setRoleID] = useState(props.user.SELECTED_ROLE.id)
useEffect(()=>{
// this called only once when A screen(this component) loaded,
// but when comeback to this screen, it doesn't called
setRoleID(props.user.SELECTED_ROLE.id)
}, [props.user])
}
So the updated state of Screen A remain same when comeback to A screen again (Not loading from props)
I am not changing props.user in screen B.
But I think const [roleID, setRoleID] = useState(props.user.SELECTED_ROLE.id)
this line should be called at least.
I am using redux-persist. I think this is not a problem. For navigation, I use this
// to go first screen A, screen B
function navigate(routeName, params) {
_navigator.dispatch(
NavigationActions.navigate({
routeName,
params,
})
);
}
// when come back to screen A from B
function goBack() {
_navigator.dispatch(
NavigationActions.back()
);
}
Is there any callback I can use when the screen appears? What is wrong with my code?
Thanks
Below solution worked for me:
import React, { useEffect } from "react";
import { useIsFocused } from "@react-navigation/native";
const ExampleScreen = (props) => {
const isFocused = useIsFocused();
useEffect(() => {
console.log("called");
getInitialData();
}, [props, isFocused]);
const getInitialData = async () => {}
return (
......
......
)
}
I've used react navigation 5+
@react-navigation/native": "5.6.1"