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copied!<p>I am posting the twitter request class method , which is calling the twitter XML API URL for sending messages . Which require authentication .</p> <pre><code>-(void)statuses_update:(NSString *)status delegate:(id)requestDelegate requestSelector:(SEL)requestSelector; { isPost = YES; // Set the delegate and selector self.delegate = requestDelegate; self.callback = requestSelector; // The URL of the Twitter Request we intend to send NSURL *url = [NSURL URLWithString:@"http://twitter.com/statuses/update.xml"]; requestBody = [NSString stringWithFormat:@"status=%@",status]; [self request:url]; } -(void)request:(NSURL *) url { theRequest = [[NSMutableURLRequest alloc] initWithURL:url]; if(isPost) { NSLog(@"ispost"); [theRequest setHTTPMethod:@"POST"]; [theRequest setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"]; [theRequest setHTTPBody:[requestBody dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES]]; [theRequest setValue:[NSString stringWithFormat:@"%d",[requestBody length] ] forHTTPHeaderField:@"Content-Length"]; } theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self]; if (theConnection) { // Create the NSMutableData that will hold // the received data // receivedData is declared as a method instance elsewhere receivedData=[[NSMutableData data] retain]; } else { // inform the user that the download could not be made } } - (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge: (NSURLAuthenticationChallenge *)challenge { //NSLog(@"challenged %@",[challenge proposedCredential] ); if ([challenge previousFailureCount] == 0) { NSURLCredential *newCredential; newCredential=[NSURLCredential credentialWithUser:[self username] password:[self password] persistence:NSURLCredentialPersistenceNone]; [[challenge sender] useCredential:newCredential forAuthenticationChallenge:challenge]; [newCredential release]; } else { [[challenge sender] cancelAuthenticationChallenge:challenge]; // inform the user that the user name and password // in the preferences are incorrect NSLog(@"Invalid Username or Password"); isFirstTime==NO; UIAlertView * userNameAlert = [[UIAlertView alloc]initWithTitle:@"Alert" message:@"Invalid credentials. Please check your login details !" delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK",nil]; [userNameAlert show]; if(delegate && callback) { if([delegate respondsToSelector:self.callback]) { [delegate performSelector:self.callback withObject:nil]; } else { NSLog(@"No response from delegate"); } } } } - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { // this method is called when the server has determined that it // has enough information to create the NSURLResponse // it can be called multiple times, for example in the case of a // redirect, so each time we reset the data. // receivedData is declared as a method instance elsewhere [receivedData setLength:0]; } - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { //NSLog([[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]); // append the new data to the receivedData // receivedData is declared as a method instance elsewhere [receivedData appendData:data]; } - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { // release the connection, and the data object [connection release]; // receivedData is declared as a method instance elsewhere [receivedData release]; [theRequest release]; // inform the user NSLog(@"Connection failed! Error - %@ %@", [error localizedDescription], [[error userInfo] objectForKey:NSErrorFailingURLStringKey]); if(errorCallback) { [delegate performSelector:errorCallback withObject:error]; } } - (void)connectionDidFinishLoading:(NSURLConnection *)connection { // do something with the data if(delegate && callback) { UIAlertView * userNameAlert = [[UIAlertView alloc]initWithTitle:@"Congratulation" message:@"Your Message is successfully posted to twitter !" delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK",nil]; [userNameAlert show]; isLoginChanged =YES; isFirstTime==NO; if([delegate respondsToSelector:self.callback]) { [delegate performSelector:self.callback withObject:receivedData]; } else { NSLog(@"No response from delegate"); } } // release the connection, and the data object [theConnection release]; [receivedData release]; [theRequest release]; } </code></pre>

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