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POUIRefreshControl with two async json downloads to populate UITableView rows and custom header view
 

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    <p>I've got an <code>UITableViewController</code> that fetches it's info from a WS json working fine.</p> <p>Now I need to populate both the table and a Table's header view with two different WS calls, on a <code>UIRefreshControl</code> pull.</p> <pre><code>-(void)refreshView:(UIRefreshControl *)refresh { dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ __block NSData *data = [self fetchNewData]; dispatch_async(dispatch_get_main_queue(), ^{ if (data) { [self fetchedData:data]; [self.tableView reloadData]; } else { //show error } [self.refreshControl endRefreshing]; }); }); } -(NSData*)fetchNewData { NSString *api = SINGLE URL; if (api) { NSData* data = [NSData dataWithContentsOfURL: [NSURL URLWithString:api]]; return data; } else { return nil; //alert } } - (void)fetchedData:(NSData *)responseData { //parse out the json data NSError* error = nil; _JSONDict = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&amp;error]; _tableDataRows = [_JSONDict objectForKey:@"tableDataRows"]; } } </code></pre> <p>Finally, <code>- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath</code> uses <code>_tableDataRows</code> to populate the table.</p> <p>Now, i want to update some labels on the Table's header view, which is a custom view from a ViewController, from a second API URL json, on the same "pull" of the <code>UIRefreshControl</code>, meaning that the loading animation should be on until both jsons are downloaded and parsed. What would be the best way?</p> <p>If you need more info just let me know.. Thanks!</p>
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    1. COWhy don't you put your WS calls in the same controller? And call them one after the other? (before reloading the tableview)
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    2. COYou can use dispatch groups [link](http://www.mikeash.com/pyblog/friday-qa-2013-08-16-lets-build-dispatch-groups.html)
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    3. CO@adriencog what do you mean exactly? Where would you put the second WS call? If I put then one after the other, I think they would go literally one after the other, i want both simultaneously asynchronically.
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