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SourceView/WebViewController.m

/*

 Copyright (C) 2018 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 View controller hosting the web view.

*/

#import "WebViewController.h"

@interface WebViewController () <WebResourceLoadDelegate>

@end

@implementation WebViewController

- (void)webView:(WebView *)sender resource:(id)identifier didFailLoadingWithError:(NSError *)error fromDataSource:(WebDataSource *)dataSource

    if (error != nil)

        // An error occurred, provide an error message to the user.

        NSString *page = error.userInfo[NSURLErrorFailingURLStringErrorKey];

        NSString *errorContent = [NSString stringWithFormat:@"<!DOCTYPE html><html><body><head></head><center><br><br><font color=red>Error: unable to load page:<br>'%@'</font></center></body></html>", page];

        [((WebView *)sender).mainFrame loadHTMLString:errorContent baseURL:[NSBundle mainBundle].bundleURL];

@end

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