Finally I solved it

Since I don't have control over the web view content, I injected to the WKWebview a java script that include a jQuery AJAX request listener.

When the listener catches a request it sends the native app the request body in the method:

webkit.messageHandlers.callbackHandler.postMessage(data);

The native app catches the message in a delegate called:

(void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message

and perform the corresponding actions

here is the relevant code:

ajaxHandler.js -

//Every time an Ajax call is being invoked the listener will recognize it and  will call the native app with the request details



$( document ).ajaxSend(function( event, request, settings )  {

    callNativeApp (settings.data);

});



function callNativeApp (data) {

    try {

        webkit.messageHandlers.callbackHandler.postMessage(data);

    }

    catch(err) {

        console.log('The native context does not exist yet');

    }

}

My ViewController delegate are:

@interface BrowserViewController : UIViewController <UIWebViewDelegate, WKUIDelegate, WKNavigationDelegate, WKScriptMessageHandler, UIWebViewDelegate>

And in my viewDidLoad(), I'm creating a WKWebView:

WKWebViewConfiguration *configuration = [[WKWebViewConfiguration alloc]init];

[self addUserScriptToUserContentController:configuration.userContentController];

appWebView = [[WKWebView alloc]initWithFrame:self.view.frame configuration:configuration];

appWebView.UIDelegate = self;

appWebView.navigationDelegate = self;

[appWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString: @http://#############]]];                                                     

Here is the addUserScriptToUserContentController:

- (void) addUserScriptToUserContentController:(WKUserContentController *) userContentController{

    NSString *jsHandler = [NSString stringWithContentsOfURL:[[NSBundle mainBundle]URLForResource:@ajaxHandler withExtension:@js] encoding:NSUTF8StringEncoding error:NULL];

    WKUserScript *ajaxHandler = [[WKUserScript alloc]initWithSource:jsHandler injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:NO];

    [userContentController addScriptMessageHandler:self name:@callbackHandler];

    [userContentController addUserScript:ajaxHandler];

}