How to reference a URL object inside a function from ViewController.swift? - swift

Question

I am trying to pass a web page to another WebView from ViewController.swift. The URL is initiated by another class.
So far I was able to create the webView, create the segue, and load a dummy web page inside that controller upon tapping on the button from ViewController.swift. When I tap the button, the correct web address gets printed on the console with print(wikiURL) call.
I tried to call the variable by first declaring a global variable inside ViewController, then modifying it inside the function, then trying to reach from the webView controller, by setting up variables.
This is the function I am calling the segue from:
func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView, calloutAccessoryControlTapped control: UIControl) {
if let vc = storyboard?.instantiateViewController(withIdentifier: "WikiViewController") as? WikiViewController {
guard let capital = view.annotation as? Capital else { return }
let wikiURL = capital.url
print(wikiURL)
navigationController?.pushViewController(vc, animated: true)
}
And this is my webView controller:
class WikiViewController: UIViewController, WKNavigationDelegate {
var webView: WKWebView!
override func loadView() {
webView = WKWebView()
view = webView
}
override func viewDidLoad() {
super.viewDidLoad()
title = webView.title
let request = URLRequest(url: URL(string: "")!)
webView.load(request)
}
}
I should be able to replace URL(string: "")!) with wikiURL, then load it inside the webView.
Thank you for any assistance.

Answer 1

In WikiViewController, instead of creating url of type Capital?, it must be of type URL?, i.e.
var url: URL?
Use this url to create the URLRequest for WKWebView.
class WikiViewController: UIViewController, WKNavigationDelegate {
var webView: WKWebView!
var url: URL?
override func loadView() {
webView = WKWebView()
view = webView
}
override func viewDidLoad() {
super.viewDidLoad()
title = webView.title
if let url = self.url {
let request = URLRequest(url: url)
webView.load(request)
}
}
}
Usage:
When creating instance of WikiViewController in mapView(_:,annotationView:, calloutAccessoryControlTapped:) method, set the property vc.url as wikiURL.
if let vc = storyboard?.instantiateViewController(withIdentifier: "WikiViewController") as? WikiViewController {
guard let capital = view.annotation as? Capital else { return }
let wikiURL = capital.url
print(wikiURL)
vc.url = wikiURL //here......
navigationController?.pushViewController(vc, animated: true)
}
Note: I've assumed that wikiURL is of type URL?. In case it is String, create a URL instance using that String and then set it as vc.url.