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copied!<p>Foursquare login page now returns a requests from Facebook website. So you could login into Foursquare using FB credentials. </p> <p>One of those responses brakes the <strong>Foursquare2</strong> logic <a href="https://s-static.ak.facebook.com/connect/xd_arbiter.php?version=10#cb=xxx&origin=https%3A%2F%2Ffoursquare.com%2Fxxx&domain=foursquare.com&relation=parent&frame=xxx&" rel="nofollow">https://s-static.ak.facebook.com/connect/xd_arbiter.php?version=10#cb=xxx&origin=https%3A%2F%2Ffoursquare.com%2Fxxx&domain=foursquare.com&relation=parent&frame=xxx&</a><strong>error=unknown_user</strong> </p> <p>Foursquare2 is looking for the "error=" in the response. And it performs a delegate call-back if it finds it.</p> <p>To fix it replace your ' webView:shouldStartLoadWithRequest:navigationType:'</p> <p>in Foursquare2.m with</p> <pre><code>- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType { NSString *url =[[request URL] absoluteString]; if ([url rangeOfString:@"facebook.com"].location != NSNotFound) return YES; //ignore Facebook authentication if ([url rangeOfString:@"code="].length != 0) { NSHTTPCookie *cookie; NSHTTPCookieStorage *storage = [NSHTTPCookieStorage sharedHTTPCookieStorage]; for (cookie in [storage cookies]) { if ([[cookie domain]isEqualToString:@"foursquare.com"]) { [storage deleteCookie:cookie]; } } NSArray *arr = [url componentsSeparatedByString:@"="]; [delegate performSelector:selector withObject:[arr objectAtIndex:1]]; [self cancel]; }else if ([url rangeOfString:@"error="].length != 0) { NSArray *arr = [url componentsSeparatedByString:@"="]; [delegate performSelector:selector withObject:[arr objectAtIndex:1]]; FourSquareLog(@"Foursquare: %@",[arr objectAtIndex:1]); } return YES; } </code></pre> <p>Notice a new </p> <pre><code>if ([url rangeOfString:@"facebook.com"].location != NSNotFound) return YES; //ignore Facebook authentication </code></pre>

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