index.js

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

const LoginPage = () => {
  const [login, setLogin] = useState('');
  const [password, setPassword] = useState('');

  const onSubmit = () => {
    login(credentials);
  }

  return (
    <View>
      <Text>Login page</Text>
      <TextInput
        label='E-mail'
        value={login}
        onChangeText={setLogin}
      />
      <TextInput
        label='Senha'
        password={password}
        onChangeText={setPassword}
      />

      <Button onPress={onSubmit}>Logar</Button>
    </View>
  );
};

export default LoginPage;