如何在react native中显示在提交Formik表单后发现错误的警报

npm install formik

import { Formik } from 'formik';
import { Alert } from 'react-native';

const MyForm = () => {
  const initialValues = { email: '', password: '' };

  const validateForm = (values) => {
    const errors = {};

    if (!values.email) {
      errors.email = 'Email is required';
    }

    if (!values.password) {
      errors.password = 'Password is required';
    }

    return errors;
  };

  const handleSubmit = (values) => {
    const errors = validateForm(values);

    if (Object.keys(errors).length > 0) {
      Alert.alert('Error', 'Please fill in all required fields');
    } else {
      // Submit form
    }
  };

  return (
    <Formik initialValues={initialValues} onSubmit={handleSubmit}>
      {({ handleChange, handleBlur, handleSubmit, values }) => (
        <View>
          <TextInput
            onChangeText={handleChange('email')}
            onBlur={handleBlur('email')}
            value={values.email}
            placeholder="Email"
          />
          <TextInput
            onChangeText={handleChange('password')}
            onBlur={handleBlur('password')}
            value={values.password}
            placeholder="Password"
            secureTextEntry
          />
          <Button title="Submit" onPress={handleSubmit} />
        </View>
      )}
    </Formik>
  );
};