使用自签名ssl证书加载网站，并在UIWebView

Question

我遇到以下问题：

我的应用有一个UIWebView，在此web view内，我想访问受website保护的SSL。 ssl certificate是自签名的

我已经实现了以下方法：

shouldStartLoadWithRequest：

-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType;
{
    if(![self authenticated])
    {
        [self setAuthenticated:NO];
        [self setUrlConnection:[[NSURLConnection alloc] initWithRequest:[self requestObj] delegate:self]];
        [[self urlConnection] start];
        return NO;
    }
    return YES;
}

didReceiveAuthenticationChallenge：

-(void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
{
    if([challenge previousFailureCount] == 0)
    {
        [self setAuthenticated:YES];
        NSURLCredential *credential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];
        [challenge.sender useCredential:credential forAuthenticationChallenge:challenge];
    }
    else [[challenge sender] cancelAuthenticationChallenge:challenge];
}

didReceiveResponse：

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response;
{
    [self setAuthenticated:YES];
    [[self webView] loadRequest:[self requestObj]];
    [[self urlConnection] cancel];
}

canAuthenticateAgainstProtectionSpace：

-(BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace
{
    return [protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust];
}

我忘记了某些功能或一行代码吗？如果我访问该网站，我收到了错误

2016-05-03 13:46:35.819 App[2121:806751] NSURLSession/NSURLConnection HTTP load failed (kCFStreamErrorDomainSSL, -9813)
2016-05-03 13:46:35.965 App[2121:806745] CFNetwork SSLHandshake failed (-9824 -> -9829)
2016-05-03 13:46:35.967 App[2121:806745] NSURLSession/NSURLConnection HTTP load failed (kCFStreamErrorDomainSSL, -9829)

网站应该显示我从服务器获得的错误几秒钟，然后加载网站。

编辑：

我还在Info.plist中添加了以下几行：

<key>NSAppTransportSecurity</key>
<dict>
    <key>NSAllowsArbitraryLoads</key>
    <true/>
</dict>

服务器配置正确（https://developer.apple.com/library/ios/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html?hl=fi）“使用ATS连接的要求”