Showing the focus and blur methods on a route

HomeRouteWithFocus.js

function getHomeRoute() {
  return {
    // Implement onWillFocus, onDidFocus, onWillBlur, or onDidBlur
    onWillFocus(event) {
      // The event is the one from React Native's Navigator. See the source code
      // for what properties it has.
    },
  };
}