React Native -在图像上添加带遮罩的圆

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

const CircleMaskedImage = ({ imageSource }) => (
  <View style={styles.container}>
    <View style={styles.mask} />
    <Image source={imageSource} style={styles.image} />
  </View>
);

const styles = StyleSheet.create({
  container: {
    position: 'relative',
  },
  mask: {
    backgroundColor: 'rgba(0, 0, 0, 0.5)',
    borderRadius: 100,
    position: 'absolute',
    top: 0,
    bottom: 0,
    left: 0,
    right: 0,
  },
  image: {
    width: 200,
    height: 200,
    borderRadius: 100,
  },
});

const App = () => (
  <View>
    <CircleMaskedImage imageSource={require('./path/to/image.png')} />
  </View>
);