WKWebView view not resizable - swift

Question

I'm creating a macOS Swift app, I'm new to Swift. I'm trying to make the view resizable like web browsers (Chrome, Firefox, etc.), however my code doesn't seem to work, and I didn't find anything useful about WKWebView resizing.
Here's my code for the ViewController:
import Cocoa
import WebKit
class ViewController: NSViewController, WKUIDelegate
{
var webView: WKWebView!
override func loadView()
{
let webConfiguration = WKWebViewConfiguration ();
webConfiguration.preferences.setValue(true, forKey: "allowFileAccessFromFileURLs");
webView = WKWebView (frame: CGRect(x:0, y:0, width:1920, height:1080), configuration:webConfiguration);
webView.uiDelegate = self;
self.view = webView;
}
override func viewDidLoad() {
super.viewDidLoad()
let webView = WKWebView(frame: CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: self.webView.frame.size.height))
self.view.addSubview(webView)
let url = URL(string: "https://www.google.com/")
webView.load(URLRequest(url: url!))
}
}
Results:

Answer 1

Okay so I figured out how to fix the issue with Willeke's recommendation:
Replace this:
let webView = WKWebView(frame: CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: self.webView.frame.size.height))
self.view.addSubview(webView)
let url = URL(string: "https://www.google.com/")
webView.load(URLRequest(url: url!))
With this:
if let url = URL(string: "https://www.roblox.com/") {
let request = URLRequest(url: url)
webView.load(request)
}