WKWebView加载HTTPS的链接

1.实现代理协议

- (void)webView:(WKWebView *)webView 
didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge 
                completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition 
disposition, NSURLCredential * _Nullable credential))completionHandler{

    if ([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]) {

    NSURLCredential *card = [[NSURLCredential alloc]initWithTrust:challenge.protectionSpace.serverTrust];

    completionHandler(NSURLSessionAuthChallengeUseCredential,card);

    }
    
}