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PORetrieve NSURL Data when loaded
 

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    <p>I have a the following retrieveData method in my SendData class. I call this class from my MovieViewController. The method checks if the data fetched from the server is correct, if it is, it returns TRUE. If it is not, it returns FALSE. It works just fine except the method returns to my MovieViewController before the data has time to "download". Hence the method always returns false because it is always null because control is returned to the original view controller.</p> <p>How do I return (AKA exit with the method with the returned value) only when the data has finished loading and not before?</p> <p>Thanks!</p> <p><strong>SendData.m</strong></p> <pre><code>-(BOOL)retrieveData:(NSString *) postID:(NSString *) message:(NSString *)token { __block BOOL value=FALSE; NSURLSessionConfiguration *sessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration]; sessionConfiguration.HTTPAdditionalHeaders = @{ @"message" : message, @"access_token": token }; postID=[NSString stringWithFormat:@"https://graph.facebook.com/%@/comments?message=%@&amp;access_token=%@",postID,message,token]; NSURLSession *session = [NSURLSession sessionWithConfiguration:sessionConfiguration]; NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:postID]]; request.HTTPMethod = @"POST"; NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { //THIS NEEDS TO BE EXECUTED BEFORE THE METHOD IS RETURNED BOOL valid; NSString* myString; myString = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding]; NSLog(@"MY string is %@", myString); if (myString != NULL || [myString length] != 0) { valid = TRUE; } else { valid = FALSE; } value=valid; }]; return value; } </code></pre>
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