Swift - Notify ViewController from AppDelegate On FCM / APN

Hello,

Recently I tried  my hands on iOS app after long time as I had to convert one of our hybrid app to native app on urgent basis. There I had webview where I was loading my html app. On FCM message receieved we need to send URL received in FCM to webview and load the URL.

So here in this blog I will mention the procedure for it.

First of all in AppDelegate we have didReceiveRemoteNotification method. There we will create notification for it. Here is the code.

let url = dict

serverURL = url;

let notificationName = Notification.Name("updateWebView")

NotificationCenter.default.post(name: notificationName, object: nil)

Now in the ViewController where you want to make updates, subscribe to this notification in viewDidLoad function.

override func viewDidLoad() {

  let notificationName = Notification.Name("updateWebView")

  NotificationCenter.default.addObserver(self, selector:            #selector(ViewController.updateWebView), name: notificationName, object: nil)

}

And then add function in ViewController.

@objc func updateWebView() {

  let appDelegate = UIApplication.shared.delegate as! AppDelegate

  let serverURL = appDelegate.serverURL

        

  guard let url = URL(string: serverURL!) else {

     print("Invalid URL")

     return

  }

        

  let request = URLRequest(url: url)

  webView.load(request)

}

That's it and now you will have data passed from AppDelegate to ViewController. This method you can pass any kind of data from FCM to respective ViewController.

Hope this helps you.