How to handle deep link routing in iOS apps with in-app browsers

ios-platform-routing.m

// I'd suggest extending this method to add a callback block to handle success/failure in your UI
- (void)loadURL:(NSURL *)destinationUrl fallbackBrowser:(WKWebView *)webview {
    
    // First check if the destination is a URI scheme
    // OR is an iTunes URL for loading an App Store page
    NSError *error = NULL;
    NSRegularExpression *regex =
    [NSRegularExpression regularExpressionWithPattern:@"^(?!(http|https)).*:////.*|.*itunes/.apple/.com.*"
                                              options:0
                                                error:&error];
    
    NSUInteger numberOfMatches = [regex numberOfMatchesInString:[destinationUrl absoluteString]
                                                        options:0
                                                          range:NSMakeRange(0, [[destinationUrl absoluteString] length])];
    
    // If there's a regex match, this means that the URL was URL-like (had ://) but did not contain http/https
    // This is indicative of a URI scheme for a third party application
    if (numberOfMatches > 0) {
        [[UIApplication sharedApplication] openURL:destinationUrl options:@{} completionHandler:^(BOOL success) {
            if (!success) {
                // This means that the app was not installed and the URI failed to resolve.
                // You can choose to fail silently here or deliver feedback to the user
            }
            else {
                // This means that the third party app was successfully loaded and your app
                // has likely been backgrounded at this point.
            }
        }];
    }
    // If there was no regex match, this means that we're dealing with a 3rd party web link.
    // Note that it's possible that this web link is a Universal Link so we'll need to test that
    // before we go ahead and load the webview.
    else {
        // First we attempt to trigger the Universal Link with openURL but flag to fail if Universal Links fail
        // This logic will let us fallback safely to our webview.
        [[UIApplication sharedApplication] openURL:destinationUrl options:@{UIApplicationOpenURLOptionUniversalLinksOnly:@1} completionHandler:^(BOOL success) {
            if (!success) {
                // The Universal Link has failed and we can proceed to load this URL in our in-app webview
                NSURLRequest *url = [[NSURLRequest alloc] initWithURL:destinationUrl];
                [webview loadRequest:url];
            }
            else {
                // This means that the third party app was successfully loaded via a Universal Link
                // and your app has likely been backgrounded at this point.
            }
        }];
    }
}