在iOS应用程序中，需要签署一个先前已获得的证书请求。当我尝试运行查询时捕获此错误:kCFURLErrorUserCancelledAuthentication-1012.文档说:kCFURLErrorUserCancelledAuthenticationTheconnectionfailedbecausetheusercancelledrequiredauthentication.实现如下:-(void)startConnection{NSString*serverURL=@"host.ru/method";MKNetworkEngine*engine=[[MKNetworkEngi