NSURLConnection同步异步方式下获取status code

#pragma mark NSURLConnection Delegate Methods
- (void)connection:(NSURLConnection*)connection didReceiveResponse:(NSURLResponse*)response {
NSHTTPURLResponse* httpResponse = (NSHTTPURLResponse*)response;
int responseStatusCode = [httpResponse statusCode];
}

NSHTTPURLResponse* urlResponse = nil;
NSError *error = [[NSError alloc] init];
responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&error];

int statusCode = [urlResponse statusCode];
int errorCode = error.code;