Boilerplate implementation of WKUIDelegate to support Javascript alerts.

WKUIDelegate.m

#pragma mark - WKUIDelegate

- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)())completionHandler
{
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil
                                                                   message:message
                                                            preferredStyle:UIAlertControllerStyleAlert];
    
    [alert addAction:[UIAlertAction actionWithTitle:NSLocalizedString(@"OK", nil) style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {
        completionHandler();
    }]];
    
    [self presentViewController:alert animated:YES completion:nil];
}

- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler
{
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil
                                                                   message:message
                                                            preferredStyle:UIAlertControllerStyleAlert];
    
    [alert addAction:[UIAlertAction actionWithTitle:NSLocalizedString(@"Cancel", nil) style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {
        completionHandler(NO);
    }]];
    
    [alert addAction:[UIAlertAction actionWithTitle:NSLocalizedString(@"OK", nil) style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
        completionHandler(YES);
    }]];
    
    [self presentViewController:alert animated:YES completion:nil];
}

- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString *result))completionHandler
{
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil
                                                                   message:prompt
                                                            preferredStyle:UIAlertControllerStyleAlert];
    
    [alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        textField.placeholder = prompt;
        textField.secureTextEntry = NO;
        textField.text = defaultText;
    }];
    
    [alert addAction:[UIAlertAction actionWithTitle:NSLocalizedString(@"Cancel", nil) style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {
        completionHandler(nil);
    }]];
    
    [alert addAction:[UIAlertAction actionWithTitle:NSLocalizedString(@"OK", nil) style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
        completionHandler([alert.textFields.firstObject text]);
    }]];
    
    [self presentViewController:alert animated:YES completion:nil];
}

@davbeck
Hi, Is there any license information?
I want to use your code in my commercial app.
But I can'f find any terms and conditions for use, reproduction, and distribution.
I wonder if I can use the code for commercial distribution or not.
Please let me know how I can use the code for commercial distribution.