I would like to update my map to show the user location. Using the code below, I get a world map not a map of the UK, which is what the latitude and longitude should show, can anyone help?
const [location, setLocation] = useState({
initialPosition: {
latitude: 0,
longitude: 0,
latitudeDelta: 0,
longitudeDelta: 0,
},
});
const getLocationPermissions = async () => {
const granted = await request(
Platform.select({
android: PERMISSIONS.ANDROID.ACCESS_COARSE_LOCATION,
ios: PERMISSIONS.IOS.LOCATION_WHEN_IN_USE,
}),
{
title: 'DemoApp',
message: 'App would like access to your location ',
}
);
return granted === RESULTS.GRANTED;
};
useEffect(() => {
// check permission
const isGranted = getLocationPermissions();
if (isGranted) {
// get location
Geolocation.getCurrentPosition((info) => {
let lat = info.coords.latitude;
let long = info.coords.longitude;
// update state with location,latitude: 52.62869394486038
//longitude: -1.9794797216434805
var initialRegion = {
latitude: lat,
longitude: long,
latitudeDelta: 0.0922,
longitudeDelta: 0.0421,
};
});
} else {
console.log('error');
}
}, []);
return (
<View style={styles.container}>
<MapView style={styles.map} initialRegion={location.initialPosition} />
</View>
);
I am guessing you are using react-native-maps MapView Component, it has a showsUserLocation boolean property.
<MapView
style={styles.map}
showsUserLocation={true}
initialRegion={location.initialPosition}
/>
Perhaps this would resolve it?
After retrieve user location from device, animate map to that region.
import * as React from "react";
import { Text, View, StyleSheet } from "react-native";
import MapView from "react-native-maps";
const App = () => {
const mapRef = React.useRef(null);
React.useEffect(() => {
// Below are mocked location in UK. Retrieve real location
// from device with Geoocation API
// latitude: 52.62869394486038
//longitude: -1.9794797216434805
const userRegion = {
latitude: 52.62869394486038,
longitude: -1.9794797216434805,
latitudeDelta: 0.0922,
longitudeDelta: 0.0421,
};
mapRef.current?.animateToRegion(userRegion);
}, []);
return (
<View style={styles.container}>
<MapView
ref={mapRef}
initialRegion={{
latitude: 37.78825,
longitude: -122.4324,
latitudeDelta: 0.0922,
longitudeDelta: 0.0421,
}}
style={styles.mapStyle}
/>
</View>
);
};
const styles = StyleSheet.create({
container: {
flex: 1,
alignItems: "center",
justifyContent: "center",
paddingTop: 10,
backgroundColor: "#ecf0f1",
},
mapStyle: {
...StyleSheet.absoluteFillObject,
},
});
export default App;
Working example snack.