iOS NSURLConnection Delegate methods
Example
//conform the NSURLConnectionDelegate protocol.
@interface ViewController : UIViewController<NSURLConnectionDelegate> { NSMutableData *_responseData; } //Implementation of the NSURLConnection protocol methods.
#pragma mark NSURLConnection Delegate Methods - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { // A response has been received, this is where we initialize the instance var you created // so that we can append data to it in the didReceiveData method // Furthermore, this method is called each time there is a redirect so reinitializing it // also serves to clear it _responseData = [[NSMutableData alloc] init]; } - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { // Append the new data to the instance variable you declared [_responseData appendData:data]; } - (NSCachedURLResponse *)connection:(NSURLConnection *)connection willCacheResponse:(NSCachedURLResponse*)cachedResponse { // Return nil to indicate not necessary to store a cached response for this connection return nil; } - (void)connectionDidFinishLoading:(NSURLConnection *)connection { // The request is complete and data has been received // You can parse the stuff in your instance variable now } - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { // The request has failed for some reason! // Check the error var } 
