我正在尝试执行SSL证书验证并已实现委托(delegate)canAuthenticateAgainstProtectionSpace-(BOOL)connection:(NSURLConnection*)connectioncanAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace*)protectionSpace{OSStatusstatus=SecTrustEvaluate(protectionSpace.serverTrust,&trustResult);if(status==errSecSuccess){}else{