如何删除选取器中的边框(iOS - react-native)

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

const App = () => {
  return (
    <View style={styles.container}>
      <Picker
        style={styles.picker}
        selectedValue={this.state.language}
        onValueChange={(itemValue, itemIndex) => this.setState({language: itemValue})}
      >
        <Picker.Item label="Java" value="java" />
        <Picker.Item label="JavaScript" value="js" />
        <Picker.Item label="Python" value="python" />
      </Picker>
    </View>
  );
};

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
  },
  picker: {
    height: 50,
    width: 150,
    borderWidth: 0, // 设置边框宽度为0以删除边框
    borderColor: 'transparent', // 设置边框颜色为透明
  },
});

export default App;