Something has changed in iOS 26 and now if custom scheme is used and web page contains scripts WebKit is terminated.
0x1130bc170 - [PID=47858] WebProcessProxy::didClose: (web process 0 crash)
0x1130bc170 - [PID=47858] WebProcessProxy::processDidTerminateOrFailedToLaunch: reason=Crash
final class CustomSchemeViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let sampleConfiguration = WKWebViewConfiguration()
sampleConfiguration.setURLSchemeHandler(
SampleURLSchemeHandler(),
forURLScheme: "sample"
)
let webView = WKWebView(frame: view.bounds, configuration: sampleConfiguration)
webView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
view.addSubview(webView)
webView.navigationDelegate = self
webView.load(URLRequest(url: URL(string: "sample://pages/sample.html")!))
}
}
extension CustomSchemeViewController: WKNavigationDelegate {
func webViewWebContentProcessDidTerminate(_ webView: WKWebView) {
print("webViewWebContentProcessDidTerminate")
}
}
final class SampleURLSchemeHandler: NSObject, WKURLSchemeHandler {
private func post(_ body: String, mimeType: String, urlSchemeTask: WKURLSchemeTask) {
let body = Data(body.utf8)
let response = URLResponse(
url: urlSchemeTask.request.url!,
mimeType: mimeType,
expectedContentLength: body.count,
textEncodingName: nil
)
urlSchemeTask.didReceive(response)
urlSchemeTask.didReceive(body)
urlSchemeTask.didFinish()
}
func webView(_ webView: WKWebView, start urlSchemeTask: WKURLSchemeTask) {
switch urlSchemeTask.request.url?.lastPathComponent {
case "sample.html":
post("""
<?xml version="1.0" encoding="UTF-8"?><html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script src="/scripts/sample.js"></script>
</head>
<body>
<p>Sample</p>
</body>
</html>
""",
mimeType: "application/xhtml+xml",
urlSchemeTask: urlSchemeTask
)
case "sample.js":
post("console.log('Hello from JS File')",
mimeType: "text/javascript",
urlSchemeTask: urlSchemeTask
)
default:
assertionFailure()
}
}
func webView(_ webView: WKWebView, stop urlSchemeTask: WKURLSchemeTask) {
print("webView(_ webView: WKWebView, stop urlSchemeTask: WKURLSchemeTask)")
}
}
It works fine with css file inside, without script tag or with async attribute
Code of sample project https://github.com/Igor-Palaguta/iOS26URLSchemeTermination