iOS WKWebView加载url，不执行didFinishNavigation代理方法

///  https://xibhe.com/2018/02/03/WKWebView-disabuse/index.html

/// WKWebView Error Domain\=NSURLErrorDomain Code\=-999 "(null)" 当前请求未返回又发起了其他的请求

/// Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service

- (void)webView:(WKWebView *)webView didFailNavigation:(WKNavigation *)navigation withError:(NSError *)error {

    if ([error code] == NSURLErrorCancelled) {

        [webView reload];

        return;

    }

}