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POGetting the NSURLConnection delegate callback into the right thread
 

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  1. POGetting the NSURLConnection delegate callback into the right thread
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    <p>I can't seem to get a Delegate callback to work when I thread my code. I am trying to call a remote server using NSURLConnection to get an access_token. The access_token is received in connection:didReceiveResponse: delegate. This is not a problem until I thread it. I thought I was passing the correct objects for my delegates, but it does not reach connection:didReceiveResponse: </p> <p>Can anyone see why connection:didReceiveResponse: in LoginViewController does not get called when I thread the call? Thanks.</p> <p>LoginViewController.m</p> <pre><code>- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { NSString *access_token = [self getTokenFromResponse: response]; [self.delegate didGetAccessToken:access_token]; } - (void)fetchAccessTokenNoUI { NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString: @"www.mysite.com"]]; [NSURLConnection connectionWithRequest:request delegate:self]; } </code></pre> <p>AccessToken.h</p> <pre><code>@interface AccessToken : NSObject @property (atomic, strong) LoginViewController *loginViewController; // doing this to try to keep it persistent - (void) fetchAccessTokenWithDelegate: (id &lt;LoginDelegate&gt;)delegate; @end </code></pre> <p>AccessToken.m</p> <pre><code>- (void) fetchAccessTokenWithDelegate: (id &lt; LoginDelegate &gt;)delegate { dispatch_queue_t downloadQueue = dispatch_queue_create("Fetch access_token queue", NULL); dispatch_async(downloadQueue, ^ { // this works fine if I don't do it in a queue self.loginViewController = [[LoginViewController alloc] init]; self.loginViewController.delegate = delegate; [self.loginViewController fetchAccessTokenNoUI]; }); dispatch_release(downloadQueue); } </code></pre> <p>CallingClass.m</p> <pre><code>- (void)didGetAccessToken:(NSString *)access_token { if (!access_token) { LoginViewController *userProfileViewController = [[LoginViewController alloc] init]; userProfileViewController.delegate = self; [self.navigationController pushViewController:userProfileViewController animated:YES]; } } - (IBAction)favourite:(id)sender { AccessToken *accessToken = [[AccessToken alloc] init]; [accessToken fetchAccessTokenWithDelegate:self]; } </code></pre>
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    1. COTake a look at http://stackoverflow.com/a/8919203/214350
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      1. USChristopher Pickslay
    2. COpossible duplicate of [GCD and async NSURLConnection](http://stackoverflow.com/questions/8918501/gcd-and-async-nsurlconnection)
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      1. USChristopher Pickslay
 

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