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    <p>I think the bit you're missing is here, SA_OAuthTwitterEngine.m:103:</p> <pre><code> //This generates a URL request that can be passed to a UIWebView. It will open a page in which the user must enter their Twitter creds to validate - (NSURLRequest *) authorizeURLRequest { if (!_requestToken.key &amp;&amp; _requestToken.secret) return nil; // we need a valid request token to generate the URL OAMutableURLRequest *request = [[[OAMutableURLRequest alloc] initWithURL: self.authorizeURL consumer: nil token: _requestToken realm: nil signatureProvider: nil] autorelease]; [request setParameters: [NSArray arrayWithObject: [[[OARequestParameter alloc] initWithName: @"oauth_token" value: _requestToken.key] autorelease]]]; return request; } </code></pre> <p>You will have to "fake" this user login out yourself, I believe by sending twitter the login credentials as a separate request. It appears that the setUsername method you're calling is actually called as a post operation once a valid access token has been received. See SA_OAuthTwitterEngine.m:185</p> <pre><code>// // access token callback // when twitter sends us an access token this callback will fire // we store it in our ivar as well as writing it to the keychain // - (void) setAccessToken: (OAServiceTicket *) ticket withData: (NSData *) data { if (!ticket.didSucceed || !data) return; NSString *dataString = [[[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding] autorelease]; if (!dataString) return; if (self.pin.length &amp;&amp; [dataString rangeOfString: @"oauth_verifier"].location == NSNotFound) dataString = [dataString stringByAppendingFormat: @"&amp;oauth_verifier=%@", self.pin]; NSString *username = [self extractUsernameFromHTTPBody:dataString]; if (username.length &gt; 0) { [[self class] setUsername: username password: nil]; if ([_delegate respondsToSelector: @selector(storeCachedTwitterOAuthData:forUsername:)]) [(id) _delegate storeCachedTwitterOAuthData: dataString forUsername: username]; } [_accessToken release]; _accessToken = [[OAToken alloc] initWithHTTPResponseBody:dataString]; } </code></pre> <p>So the steps are as follows:</p> <ol> <li>Request request token</li> <li>Fake user login to twitter and get the pin value</li> <li>Set the pin on the engine</li> <li>Request access token</li> </ol> <p>You can see where SA_OAuthTwitterController parses the pin out of the webview content in SA_OAuthTwitterController.m:156</p> <pre><code>#pragma mark Webview Delegate stuff - (void) webViewDidFinishLoad: (UIWebView *) webView { NSError *error; NSString *path = [[NSBundle mainBundle] pathForResource: @"jQueryInject" ofType: @"txt"]; NSString *dataSource = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:&amp;error]; if (dataSource == nil) { NSLog(@"An error occured while processing the jQueryInject file"); } [_webView stringByEvaluatingJavaScriptFromString:dataSource]; //This line injects the jQuery to make it look better NSString *authPin = [[_webView stringByEvaluatingJavaScriptFromString: @"document.getElementById('oauth_pin').innerHTML"] stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]]; if (authPin.length == 0) authPin = [[_webView stringByEvaluatingJavaScriptFromString: @"document.getElementById('oauth_pin').getElementsByTagName('a')[0].innerHTML"] stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]]; [_activityIndicator stopAnimating]; if (authPin.length) { [self gotPin: authPin]; } if ([_webView isLoading] || authPin.length) { [_webView setHidden:YES]; } else { [_webView setHidden:NO]; } } </code></pre> <p>hope this helps.</p>
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    1. COThanks for awesome answer. However I ended up using the UIWebView. I thought most apps were doing using oAuth on those UITextFields, but they're not. Hence the "posted via API".
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