当我尝试使注册验证表单成为react native时，未定义不是对象(计算'event.target name')

import React, { useState } from 'react';
import { TextInput, Button, View, Text } from 'react-native';

const RegistrationForm = () => {
  const [username, setUsername] = useState('');

  const handleUsernameChange = (event) => {
    setUsername(event.nativeEvent.text);
  };

  const handleSubmit = () => {
    if (username.length < 3) {
      alert('Username must be at least 3 characters long.');
    } else {
      // Proceed with form submission
    }
  };

  return (
    <View>
      <TextInput
        style={{ height: 40, borderColor: 'gray', borderWidth: 1 }}
        onChangeText={handleUsernameChange}
        value={username}
        placeholder="Username"
      />
      <Button title="Submit" onPress={handleSubmit} />
    </View>
  );
};

export default RegistrationForm;