How to centre a MapView on a user’s current location when the Map Screen is opened? React Native Expo


How to centre the map to show a user’s current location when the map screen is opened? By following the expo documentation, it should be achieved with Expo Location API? However, the documentation is unclear. I took part of the code from expo Location documentation and implemented it in my Map Screen. So, how should I integrate it in MapView to execute the getCurrentPositionAsync method and centre the map accordingly when the map screen is opened?

import React, { useContext, useState, useEffect } from "react";
import MapView from "react-native-maps";
import styled from "styled-components";
import { Searchbar } from "react-native-paper";
import { View } from "react-native";

import * as Location from 'expo-location';

const Map = styled(MapView)`
height: 100%;
width: 100%;
`;

const SearchBarContainer= styled(View)`
padding: ${(props) => props.theme.space[3]};
position: absolute;
z-index: 999;
top: 20px;
width: 100%;
`;

export const MapScreen = ({navigation}) => {

  const [location, setLocation] = useState(null);
  const [errorMsg, setErrorMsg] = useState(null);

  useEffect(() => {
    (async () => {
      let { status } = await Location.requestForegroundPermissionsAsync();
      if (status !== 'granted') {
        setErrorMsg('Permission to access location was denied');
        return;
      }

      let location = await Location.getCurrentPositionAsync({});
      setLocation(location);
    })();
  }, []);

  return (
    <> 
    <SearchBarContainer>
      <Searchbar placeholder="location"/>
    </SearchBarContainer>
    <Map >
      
    </Map>
    </>
  );};

Source: JavaSript – Stack Overflow

November 23, 2021
Category : News
Tags: expo | javascript | react native | react-native-maps | reactjs

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Senior Software Developer

Creator of @LzoMedia I am a backend software developer based in London who likes beautiful code and has an adherence to standards & love's open-source.