MyButton.jsx

import React from 'react';
import { Text, TouchableHighlight } from 'react-native';

class MyButton extends Component {
  _onPressButton() {
    console.log('You tapped the button!');
  }

  render() {
    return (
      <TouchableHighlight onPress={this._onPressButton}>
        <Text>Button</Text>
      </TouchableHighlight>
    );
  }
}