How to show an actionsheet when the username/password isn´t correct for Twitter?

I want that my app shows an actionsheet when the user presses on the "Tweet"-Button and the username or password is wrong. For my Twitterfunction I use the TwitterRequest.m/h from Brandon Trebitowski. If everthing works great and the username/password is right, this happens in my app:

        TwitterRequest * t = [[TwitterRequest alloc] init];
        (...);
        [t statuses_update:twittermessage.text delegate:self requestSelector:@开发者_StackOverflow中文版selector(status_updateCallback:)];

        loadingActionSheet = [[UIActionSheet alloc] initWithTitle:@"Posting to Twitter..." delegate:nil 
                                                cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:nil];
        [loadingActionSheet showInView:self.view];
    }


    - (void) status_updateCallback: (NSData *) content {
        [loadingActionSheet dismissWithClickedButtonIndex:0 animated:YES];
        [loadingActionSheet release];
        NSLog(@"%@",[[NSString alloc] initWithData:content encoding:NSASCIIStringEncoding]);
    }

But how can I show an other actionsheet when the username/password was wrong? Here is the TwitterRequest.m:

#import "TwitterRequest.h"

@implementation TwitterRequest

@synthesize username;
@synthesize password;
@synthesize receivedData;
@synthesize delegate;
@synthesize callback;
@synthesize errorCallback;

-(void)friends_timeline:(id)requestDelegate requestSelector:(SEL)requestSelector{
    isPost = NO;
    // 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/friends_timeline.xml"];
    [self request:url];
}

-(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];

    } else {
        [[challenge sender] cancelAuthenticationChallenge:challenge];
        // inform the user that the user name and password
        // in the preferences are incorrect
        NSLog(@"Invalid Username or Password");
    }

}

- (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) {
        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];
}

-(void) dealloc {
    [super dealloc];
}


@end

Sorry for this stupid question, but I'm learning Objective-C and programming in general since just one week and I don´t know correctly how to interact from my ViewController with other classes.

To implement an action sheet, you must first implement the UIActionSheetDelegate in the header file (include UIActionSheetDelegate in the @interface definition between the <>).

In your code you are going to display the action sheet and catch the actions from the button press. To display an action sheet, do the following:

UIActionSheet *actionSheet = [[UIActionSheet alloc]
                              initWithTitle:@"Choose one, por favor"
                              delegate:self
                              cancelButtonTitle:@"Cancel"
                              destructiveButtonTitle:nil
                              otherButtonTitles:@"Save Favorite", @"Email", nil];
actionSheet.actionSheetStyle = UIActionSheetStyleBlackTranslucent;
actionSheet.cancelButtonIndex = 2;
[actionSheet showInView:self.view];
[actionSheet release];

To act on the button press, use the following method:

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
    // the user clicked one of the OK/Cancel buttons
    NSLog(@"The button index is: %i", buttonIndex);

    switch (buttonIndex) {
        case 0:
            NSLog(@"Button 0");
            [self saveNew];
            break;
        case 1:
            NSLog(@"Button 1");
            [self sendEmail];
            break;
        case 2:
            NSLog(@"Button 2");
            break;
        default:
            break;
    }
}

Your other option is to use an alert -- for an incorrect username/password, this may be the best option. The alert is a modal box displayed in the center of the screen. To implement an alert, implement the UIAlertViewDelegate in your header file.

Sample alert code is as follows:

UIAlertView *alert;
alert = [[UIAlertView alloc] initWithTitle:@"Ouch!"
  message:@"Your message is placed here"
  delegate:self 
  cancelButtonTitle:@"OK" 
  otherButtonTitles: nil];
[alert show];   
[alert release];

if you want to react when the user receives a request for authentication, you need to work inside didReceiveAuthenticationChallenge.

specifically, right above this line:

newCredential=[NSURLCredential credentialWithUser:[self username]
                                             password:[self password]
                                          persistence:NSURLCredentialPersistenceNone];

is where you want to be getting the username and password from the user.

if you want to handle a failure on authentication, you wanna piggyback on the 'else' clause in the previousCountFailure if statement.

specifically, after this line is where you want to tell the user they failed:

[[challenge sender] cancelAuthenticationChallenge:challenge];