WebView does not load - ios

Question

I just started developing with swift, so I am sorry if the question is basic/stupid.
I have the following setup, just a test
import WebKit
import UIKit
class ViewController: UIViewController, WKNavigationDelegate {
var webView: WKWebView!
override func loadView() {
webView = WKWebView()
webView.navigationDelegate = self
view = webView
}
override func viewDidLoad() {
super.viewDidLoad()
let url = URL(string: "https://hackingswift.com")!
webView.load(URLRequest(url:url))
webView.allowsBackForwardNavigationGestures = true
}
}
Unfortunately the browser doesn't load. The simulator only shows an empty navigation bar.
Suggestions? I am following a tutorial on hackingswift, so it's supposed to work.

Answer 1

You have to add webView as a subview or make an IBOutlet using Interface builder.
Try this:
class ViewController: UIViewController, WKNavigationDelegate {
var webView: WKWebView?
func loadView() {
webView = WKWebView()
webView?.navigationDelegate = self
self.view.addSubview(webView!)
}
override func viewDidLoad() {
super.viewDidLoad()
self.loadView()
let url = URL(string: "https://hackingswift.com")!
webView?.load(URLRequest(url:url))
webView?.allowsBackForwardNavigationGestures = true
}
}
If you want it a bit more simple (without nullable variable), for example:
class ViewController: UIViewController, WKNavigationDelegate {
var webView = WKWebView()
override func viewDidLoad() {
super.viewDidLoad()
webView.navigationDelegate = self
self.view.addSubview(webView)
webView?.allowsBackForwardNavigationGestures = true
self.loadUrl("https://hackingswift.com")
}
func loadUrl(_ url: String) {
if let url = URL(string: url) {
webView.load(URLRequest(url:url))
}
}
}

Answer 2

EDIT: it looks like some websites to load, while others do not, even if they are secure. If I put apple.com in the example, it loads, but a few others do not
Your url should be started with http or https for the webView to load.
Another possible reason is that your url containing an invalid certificate. Add the delegate function below into your code. You have to let WKWebView to bypass the certificate checking. However, this code is never recommended to go into production. You should be careful about what website your webView should and will load.
func webView(_ webView: WKWebView, didReceive challenge: URLAuthenticationChallenge, completionHandler: #escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {
let cred = URLCredential(trust: challenge.protectionSpace.serverTrust!)
completionHandler(.useCredential, cred)
}

Answer 3

The problem is this line:
let url = URL(string: "https://hackingswift.com")!
There is no such URL on the Internet, so you're not actually going to see anything. (You won't see anything if you paste that URL into any browser.)
So change that line to this:
let url = URL(string: "https://www.hackingwithswift.com")!
Now run the app, and presto, you'll see the web site: