Question

I’ve been trying to get OAuth for Twitter to work on my iPhone application for the last couple of days, and I cannot for the life of me figure out why I’m getting this error. I’ve changed the way I’ve been approaching this for a while now, but still nothing. So I turn to SO to hopefully figure it out.

The tutorial is linked here. Downloading the application and running it works PERFECTLY. It doesn’t work for me.

Here’s the error I get –

2010-07-25 20:04:52.224 AppTest[4620:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[OAToken setVerifier:]: unrecognized selector sent to instance 0x6c2acc0'

Anyone can tell me what I’m doing wrong? I’m using pretty much the same code.

EDIT: Here’s the code where I use setVerifier:

- (IBAction)finishSetup:(id)sender {

        NSString *thePin = [[NSString alloc] initWithString:pinText.text];
        NSLog(@"%@", thePin);
        if([thePin length] == 7 && [[NSScanner scannerWithString:thePin] scanInt:NULL]) {

            loadingView.hidden = NO;

            [pinText resignFirstResponder];

            OAConsumer *consumer = [[OAConsumer alloc] initWithKey:consumer_key secret:consumer_secret];
            OADataFetcher *fetcher = [[OADataFetcher alloc] init];
            NSURL *url = [NSURL URLWithString:@"https://api.twitter.com/oauth/access_token"];

            [accessToken setVerifier:pinText.text];

            NSLog(@"Using PIN %@", accessToken.verifier);
            OAMutableURLRequest *request = [[OAMutableURLRequest alloc] initWithURL:url consumer:consumer token:accessToken realm:nil signatureProvider:nil];
            [request setHTTPMethod:@"POST"];

            NSLog(@"Getting access token...");

            [fetcher fetchDataWithRequest:request delegate:self didFinishSelector:@selector(accessTokenTicket:didFinishWithData:) didFailSelector:@selector(accessTokenTicket:didFailWithError:)];

        } else {

            loadingView.hidden = YES;
            error_alert = [[UIAlertView alloc]  initWithTitle:@"TestApp" message:@"The PIN you have entered is invalid. Please try again." delegate:self cancelButtonTitle:@"Cancel Login" otherButtonTitles:@"Try again", nil];
            [error_alert show];
            [error_alert release];

        }

        [thePin release];

    }

Answer 1

If this works, the new XCode 4 is amazing. I downloaded the ZIP file on the tutorial you linked and it appears as if OAMutableURLRequest.m has errors throughout the file thinking that NSString responds to URLEncodedString.

Try updating URLEncodedString to

stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding

Let me know if that works!