WKWebView open links in Safari

wkwebview_links_externally.swift

import WebKit

class ViewController: UIViewController {
	// Connect the webView from the StoryBoard.
	@IBOutlet weak var webView: WKWebView!

	override func viewDidLoad() {
		super.viewDidLoad()
		// Get the path of the index.html which is part of the Xcode project (resp. in the main bundle).
		guard let htmlPath = Bundle.main.path(forResource: "index", ofType: "html") else {
			return
		}
		// Create an URL to load it in the webView.
		let url = URL(fileURLWithPath: htmlPath)
		let request = URLRequest(url: url)
		webView.navigationDelegate = self
		webView.load(request)
	}
}

extension ViewController: WKNavigationDelegate {
	func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
		// Check for links.
		if navigationAction.navigationType == .linkActivated {
			// Make sure the URL is set.
			guard let url = navigationAction.request.url else {
				decisionHandler(.allow)
				return
			}

			// Check for the scheme component.
			let components = URLComponents(url: url, resolvingAgainstBaseURL: false)
			if components?.scheme == "http" || components?.scheme == "https" {
				// Open the link in the external browser.
				UIApplication.shared.open(url)
				// Cancel the decisionHandler because we managed the navigationAction.
				decisionHandler(.cancel)
			} else {
				decisionHandler(.allow)
			}
		} else {
			decisionHandler(.allow)
		}
	}
}

@raymond-1227 if you want want to detect magnet-links you can use a similar approach as how this code detects the links. You can use the scheme attribute of the URLComponent.

if components?.scheme == "magnet" {
    // Do whatever you want.
}

I tried the method, but I'm not sure why if I use the code, it'll say WebPageProxy::didFailProvisionalLoadForFrame: frameID=575, domain=NSURLErrorDomain, code=-999 when the code was set like this:

if components?.scheme == "roblox-player" {
      decisionHandler(.allow)
}

I think the error was dedicated to the custom scheme, because if I use webview.uiDelegate (which doesn't handle external links) the error doesn't appear.