WKWebView not opening custom URL scheme (js opens custom scheme link in new window)

Question

I have a WKWebView in my application. I don't use UIWebView, because for some strange reason it doesn't open properly a web page with a lot of JS code in it.

When I tap on the link with custom url scheme "scm://", it does nothing...

My code:

- (void)viewDidLoad {
    // ...

    WKWebViewConfiguration *configuration = [WKWebViewConfiguration new];
    if ([configuration respondsToSelector:@selector(setDataDetectorTypes:)])
        [configuration setDataDetectorTypes:WKDataDetectorTypeLink];

    myWebView = [[WKWebView alloc] initWithFrame:webFrame configuration:configuration];
    myWebView.navigationDelegate = self;

    [self.view addSubview:myWebView];
}

#pragma mark - WKNavigationDelegate

- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
{
    NSURL *requestURL = navigationAction.request.URL;
    UIApplication *app = [UIApplication sharedApplication];
    if ([requestURL.scheme.lowercaseString isEqualToString:@"scm"] && [app canOpenURL:requestURL]) {
        [app openURL:requestURL];
        decisionHandler(WKNavigationActionPolicyCancel);
    }
    else
        decisionHandler(WKNavigationActionPolicyAllow);
}

- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation
{
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}

- (void)webView:(WKWebView *)webView didFailNavigation:(WKNavigation *)navigation withError:(NSError *)error
{
    [self handleError:error];
}

- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation withError:(NSError *)error
{
    [self handleError:error];
}

#pragma mark - Handle web view errors.

- (void)handleError:(NSError *)error
{
    UIApplication *app = [UIApplication sharedApplication];
    app.networkActivityIndicatorVisible = NO;

    NSURL *failedUrl = error.userInfo[NSURLErrorFailingURLErrorKey];

    if ([failedUrl.scheme.lowercaseString isEqualToString:@"scm"]) {
        [app openURL:failedUrl];
    }
}

When I click custom url, handleError() is never called, neither decidePolicyForNavigationAction().

Answer 1

Ok, figured this out... happens that the link was opening in new window, so adding next code along with setting UIDelegate made it work

    // Somewhere in viewDidLoad()...
    myWebView.UIDelegate = self;
}

- (WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures
{
    NSLog(@"createWebViewWithConfiguration %@ %@", navigationAction, windowFeatures);
    if (!navigationAction.targetFrame.isMainFrame) {
        [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
        [(WKWebView *)_webView loadRequest:navigationAction.request];
    }
    return nil;
}