Here is the guts of my code for the webView() method.

let url = navigationAction.request.url

        if let host = url?.host {
            for website in websites {
                if host.contains(website) {
                    decisionHandler(.allow)
                    return
                }
            }
        }
        let alert = UIAlertController(
            title: "Not Allowed",
            message: "Browsing outside of this website is not allowed",
            preferredStyle: .alert)

        alert.addAction(UIAlertAction(
            title: "Ok, I won't do it again.",
            style: .default))

        decisionHandler(.cancel)
        present(alert, animated: true)

I am hitting the decisionHandler(.cancel) line everytime I try to navigate outside the site BUT also when I visit apple.com via the my open button in the navbar. I feel like I've checked everything. It's setup exactly like the tutorial said. It's gotta be something small but I have racked my brain and can't figure it out...

I am convinced there is something with the sites... I just absolutely cannot figure this out and it's like 3 lines of code it's driving me insane...

What is in your websites property?

It's just the line from the tutotial...

var websites = ["apple.com", "hackingwithswift.com"]

I had the same issue. It appeard only to be apple.com for me as well. I ended up ignoring it