WKWebViewのエラー処理は ユーザー操作によるキャンセルの error.code -999 を無視するべし。 #CodePiece

CodePiece.m

- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation withError:(NSError *)error{
    
    if (error && !([error.domain isEqualToString:NSURLErrorDomain] && error.code == NSURLErrorCancelled)) {
        UIAlertController *alertController = [UIAlertController alertControllerWithTitle:[NSString stringWithFormat:@"Error : %ld",(long)error.code]
                                                                                 message:error.localizedDescription
                                                                          preferredStyle:UIAlertControllerStyleAlert];
        [alertController addAction:[UIAlertAction actionWithTitle:@"Cancel"
                                                            style:UIAlertActionStyleCancel
                                                          handler:nil]];
        // 続けるボタン
        [alertController addAction:[UIAlertAction actionWithTitle:@"Retry" 
                                                            style:UIAlertActionStyleDefault
                                                          handler:^(UIAlertAction *action) {
            // リロード処理の実装
        }]];
        [self presentViewController:alertController animated:YES completion:nil];
    }
    
}