react native基于expo上传图片组件expo-image-picker的使用

import React, { useState } from 'react';
import { StyleSheet, Button, View, Image, Text } from 'react-native';
import * as ImagePicker from 'expo-image-picker';
 
export default function App() {
  const [image, setImage]�] = useState(null);
 
  const pickImage = async () => {
    // 选择图片
    let result = await ImagePicker.launchImageLibraryAsync({
      mediaTypes: ImagePicker.MediaTypeOptions.All,
      allowsEditing: true,
      aspect: [4, 3],
      quality: 1,
    });
 
    if (!result.cancelled) {
      setImage(result.uri);
    }
  };
 
  return (
    <View style={styles.container}>
      <Button title="选择图片" onPress={pickImage} />
      {image && <Image source={{ uri: image }} style={styles.image} />}
    </View>
  );
}
 
const styles = StyleSheet.create({
  container: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
  },
  image: {
    width: 200,
    height: 200,
    marginTop: 20,
  },
});

这段代码展示了如何在React Native应用中使用expo-image-picker来选择并显示图片的基本用法。通过一个按钮触发pickImage函数，该函数调用ImagePicker.launchImageLibraryAsync来打开图片库，用户选择图片后，图片的URI被存储在状态image中，并且通过Image组件显示出来。