SceneDelegate.swift

import UIKit
import SwiftUI
import HeartyRecipeHelper

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    // ...

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        
        // ...
        
        DispatchQueue.main.asyncAfter(deadline: .now() + 1) { [weak self] in
            guard let self = self else { return }
            
            if let url = connectionOptions.urlContexts.first?.url {
                self.handleURL(url: url)
            }
        }
    }

    // ...
    
    func scene(_ scene: UIScene, openURLContexts URLContexts: Set<UIOpenURLContext>) {
        guard let url = URLContexts.first?.url else {
            return NSLog("No URL passed to open the app")
        }
        
        handleURL(url: url)
    }
    
}

extension SceneDelegate {
    
    func handleURL(url: URL) {
        guard let recipe = recipeData?.first(where: { $0.widgetURL == url }) else {
            let message = "Sorry, we can't find the recipe named \'\(url.host?.removingPercentEncoding ?? "")\'"
            let alertController = UIAlertController(title: "Incoming Message", message: message, preferredStyle: .alert)
            let okAction = UIAlertAction(title: "OK", style: UIAlertAction.Style.default, handler: nil)
            alertController.addAction(okAction)
            
            window?.rootViewController?.present(alertController, animated: true, completion: nil)
            
            return
        }
        
        if let nc = window?.rootViewController?.children.first?.children.first as? UINavigationController {
            // if the view currently being displayed is DetailRecipeView, go back to the root view controller
            if nc.title == "Detail Recipe" {
                nc.popToRootViewController(animated: true)
            }
            // push the DetailRecipeView
            nc.pushViewController(HostingController(rootView: DetailRecipeView(recipe: recipe)), animated: true)
        } else {
            window?.rootViewController?.present(HostingController(rootView: DetailRecipeView(recipe: recipe)), animated: true, completion: nil)
        }
    }
    
}