MyInput.jsx

import React, { Component } from 'react';
import { TextInput } from 'react-native';

class UselessTextInput extends Component {
  constructor(props) {
    super(props);
    this.state = { text: 'Useless Placeholder' };
  }

  render() {
    return (
      <TextInput
        onChangeText={(text) => this.setState({ text })}
        value={this.state.text}
      />
    );
  }
}