When you long press on a hyperlink in a WkWebview you get an action sheet. I want to override that action sheet with my own set of options when it is long pressed, but behave normally otherwise. I can get the the long press event, but I don't know how to:
One simple (but radical) way to cancel an action sheet is to override
presentViewController:animated:completion: in your app's root view controller.
override func present(_ viewControllerToPresent: UIViewController, animated flag: Bool, completion: (() -> Void)? = nil) {
guard let alertController = viewControllerToPresent as? UIAlertController,
alertController.preferredStyle == .actionSheet else {
// Not an alert controller, present normally
super.present(viewControllerToPresent, animated: flag, completion: completion)
return
}
// Create and open your own custom alert sheet
let customAlertController = UIAlertController(...)
super.present(customAlertController, animated: flag, completion: completion)
}
You can retrieve the link's URL from alertController.title, and if you need to retrieve other attributes, I suggest you look at this commit to Firefox iOS, that uses a JS script handler to find the clicked element and send its attributes back to the app.
Also you'd need to write some logic to prevent cancelling any other alert sheet other than WKWebView's, that you app may use.
Here's a working solution for overriding the menu. I would still like to get some html attributes, but don't know how to do that yet.
override func loadView() {
super.loadView()
let contentController = WKUserContentController();
let userScript = WKUserScript(
source: "redHeader()",
injectionTime: WKUserScriptInjectionTime.AtDocumentEnd,
forMainFrameOnly: true
)
contentController.addUserScript(userScript)
contentController.addScriptMessageHandler(
self,
name: "callbackHandler"
)
let config = WKWebViewConfiguration()
config.userContentController = contentController
self.webView = WKWebView(frame: self.view.frame, configuration: config)
self.webView.navigationDelegate = self
self.view = self.webView
let lpress = UILongPressGestureRecognizer(target: self, action: "webViewLongPressed:")
lpress.delegate = self
self.webView.scrollView.addGestureRecognizer(lpress)
}
func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer otherGestureRecognizer: UIGestureRecognizer) -> Bool {
return true
}
func webViewLongPressed(sender:UILongPressGestureRecognizer!) {
longpress = true
if (sender.state == UIGestureRecognizerState.Ended) {
print("Long press Ended")
//This is where everything starts to happen
} else if (sender.state == UIGestureRecognizerState.Began) {
print("Long press detected.")
}
}
func webView(webView: WKWebView, decidePolicyForNavigationAction navigationAction: WKNavigationAction, decisionHandler: ((WKNavigationActionPolicy) -> Void)) {
if let myUrlStr : String = navigationAction.request.URL!.absoluteString {
if myUrlStr.lowercaseString.rangeOfString("/book/") != nil {
/* Do not allow links to be tapped */
var parts = myUrlStr.componentsSeparatedByString("/")
let id = Int(parts[4])
if navigationAction.navigationType == .LinkActivated && longpress == true {
decisionHandler(.Cancel)
let ac = actionMenu(self, id: id!, user_id: 1)
self.presentViewController(ac, animated: true) {
}
longpress = false
return
}
}
}
decisionHandler(.Allow)
}
//Build action sheet
func actionMenu(sender: UIViewController, id: Int, user_id: Int) -> UIAlertController {
let alertController = UIAlertController(title: "Title", message: "Some message.", preferredStyle: .ActionSheet)
let cancelAction = UIAlertAction(title: "Cancel", style: .Cancel) { (action) in
}
alertController.addAction(cancelAction)
let someAction = UIAlertAction(title: "Some action", style: .Default) { (action) in
//do something, call a function etc, when this action is selected
}
alertController.addAction(someAction)
return alertController
}