如何通过许可获取用户城市名称位置并将该城市名称位置发送到后端？

Question

如何通过许可获取用户城市名称位置并将该城市名称位置发送到后端？我怎样才能在我的代码中做这件事？在 React Native Expo 和 Nodejs 中

后端：

router.post('/updateCity', (req, res) => {
  const city = req.body.city;
  const username = req.body.username;

  User.findOneAndUpdate({ username: username }, { city: city }, (err, user) => {
    if (err) {
      return res.status(500).json({
        error: err
      });
    }
    res.status(200).json({
      message: 'City updated successfully'
    });
  });
});

前端：

import { StyleSheet, Text, View } from 'react-native'
import React from 'react'

const App = () => {
  return (
    <View>
      <Text>App</Text>
    </View>
  )
}

export default App

const styles = StyleSheet.create({})

Answer 1

将 expo 模块 Location 与此方法一起使用 Location.reverseGeocodeAsync(location, options)

location = await Location.getCurrentPositionAsync({ accuracy: 1 });
if (location) {
  const geocodedAddress = await Location.reverseGeocodeAsync(
    {
      latitude: location.coords.latitude,
      longitude: location.coords.longitude,
    }
  );
  console.log(geocodedAddress.city)
}