yarn add react-native-shadow
yarn add react-native-svg   // 这个是必须的,阴影依赖这个包

四周都有阴影,如下设置

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

const App = () => {
  const shadowOpt = {
    width: 168, // 与子元素高一致
    height: 168, // 与子元素宽一致
    color: '#000', // 阴影颜色
    border: 7, // 阴影宽度
    radius: 10, // 与子元素圆角一致
    opacity: 0.45, // 透明
    x: 0, // 偏移量
    y: 0,
    style: {marginVertical: 5},
  };

  return (
    <View style={{marginLeft: 100}}>
      <BoxShadow setting={shadowOpt}>
        <View style={{width: 168, height: 168, backgroundColor: '#FFF'}}>
          <Text>111</Text>
        </View>
      </BoxShadow>
    </View>
  );
};

const styles = StyleSheet.create({
  container: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
    borderRadius: 20,
  },
});

export default App;