Respond only to user interface components

Question

Respond only to user interface components

I have a very simple ViewController written in Swift with its user interface built into the Storyboard. It just changes the text of the label when someone presses a button.

class ViewController: UIViewController {
    @IBOutlet weak var label: UILabel!

    @IBAction func changeText() {
        switch label.text! {
            case "Old Text":
                label.text = "New Text"
            case "New Text":
                label.text = "Old Text"
            default:
                break
        }
    }
}

I want to use React Native for my project, but only for handling user interface components, not the application logic itself. How can i do this? I laid out the button and the text with the answer.

var Button = require('react-native-button');

class TestProject extends Component {
  render() {
    return (
      <View style={styles.container}>
        <Button style={styles.button}>Change Text</Button>
        <Text style={styles.text}>
          Text to be changed
        </Text>
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF',
  },
  text: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  button: {
    borderWidth: 1,
    borderColor: 'blue'
  },
});