Checking if request URL contains swift webview - ios

Question

I am trying to check if the URL contains "external" something like "www.example.com/?external=1" then it should open in a external browser otherwise open locally below is the code please help me to get this fix. Thanks
class ViewController: UIViewController, WKNavigationDelegate {
let webView = WKWebView()
override func viewDidLoad() {
super.viewDidLoad()
webView.frame = view.bounds
webView.navigationDelegate = self
let url = URL(string: "https://www.example.com")!
let urlRequest = URLRequest(url: url)
webView.load(urlRequest)
webView.autoresizingMask = [.flexibleWidth,.flexibleHeight]
view.addSubview(webView)
}
func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: #escaping (WKNavigationActionPolicy) -> Void) {
if navigationAction.navigationType == .linkActivated {
if let url = navigationAction.request.url,
let host = url.host, !host.hasPrefix("external"),
UIApplication.shared.canOpenURL(url) {
UIApplication.shared.open(url)
print(url)
print("Redirected to browser. No need to open it locally")
decisionHandler(.cancel)
return
} else {
print("Open it locally")
decisionHandler(.allow)
return
}
} else {
print("not a user click")
decisionHandler(.allow)
return
}
}
}
I tried to change the code like:
url.hasPrefix("external")
But it's giving error "Value of type URL has no member 'hasPrefix'"