Minimal ViewController that shows a react component

ReactViewController.swift

import Foundation
import React

class ViewController: UIViewController {
    var reactRootView: RCTRootView!
    var jsCodeLocation: URL!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        #if DEBUG
            jsCodeLocation = URL(string: "http://localhost:8081/index.ios.bundle?platform=ios")
        #else
            jsCodeLocation = Bundle.main.url(forResource: "main", withExtension: "jsbundle")
        #endif
        
        reactRootView = RCTRootView(
            bundleURL: jsCodeLocation,
            moduleName: "StoryReactComponent",
            initialProperties: nil,
            launchOptions: nil)
        self.view.addSubview(reactRootView)
    }
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        reactRootView.frame = self.view.bounds
    }   
}