Mapview - 检查“App"的渲染方法 [英] Mapview - Check the render method of 'App'

问题描述

我正在使用 React Native 在应用程序中构建地图视图.但是当我运行应用程序时出现此错误:

I'm building mapview in the app by using react native. but I got this error when I run the application:

检查'App'的渲染方法

Check the render method of 'App'

这段代码有什么问题?抱歉，我是 React Native 的新手.

What's wrong with this code? Sorry I'm new in react native.

App.js

import React, {Component, Fragment} from 'react';
import {
  Platform,
  StyleSheet,
  View,
  MapView
} from 'react-native';

type Props = {};
export default class App extends Component<Props> {
  render() {
    return (
      <View style={styles.container}>
        <MapView
        style={styles.map}
          provider={null}
          initialRegion={{
            latitude: 37.78825,
            longitude: -122.4324,
            latitudeDelta: 0.0922,
            longitudeDelta: 0.0421,
          }}
        />
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    position: 'absolute',
    top: 0,
    left: 0,
    right: 0,
    bottom: 0,
    justifyContent: 'flex-end',
    alignItems: 'center',
  },
  map: {
    position: 'absolute',
    top: 0,
    left: 0,
    right: 0,
    bottom: 0,
  },
});

index.js

import { AppRegistry } from 'react-native';
import App from './App';

AppRegistry.registerComponent('newapp', () => App);

推荐答案

取决于您创建应用程序的方式，但您的 MapView 导入不正常.MapView 不是 react-native sdk 组件.

Depending how you created your app but your MapView import is not ok. MapView is not a react-native sdk component.

你可以去MapView官方git hub安装，然后

从'react-native-maps'导入MapView;

或者，您可以使用 Expo MapView(如果您创建了您的应用程序)并添加以下行:

Or, you can use Expo MapView (if you created your app from the tool) and add this line:

import { MapView } from 'expo';

无需安装任何其他东西.两个版本是一样的东西.

without installing anything else. The two versions are the same things.

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