Let's say I want to use the rest API of some service, Twitbookr, to get a user's profile information. So I get the user to log in via my app and I get the credentials needed to make the call.
After this I load a new ViewController. I want to populate the fields in this view with the user's profile information. So I make my first call to the API:
[NSURLConnection sendAsynchronousRequest:req queue:NSOperation.mainQueue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error){ // successfully fetch data using credentials // assume complete code here including dispatch_async etc self.data = data;})];Then I want to use the data:
self.nameLabel.text = [self.data objectForKey:@"name"];self.userid = [self.data objectForKey:@"userid"];But the request hasn't finished yet, so the program throws an error.
And I want to make more calls to get different types of data, for example, the pictures from the frontpage album, which rely on the userid which I can only get from the request above. So how do I make my next subsequent call making sure I already have the userid from the first call?
What's the correct way to handle this situation?
Should I be using synchronous requests instead?Should I put up a loading symbol until all of my requests are done? If so, how do I test that the requests have actually finished? And what's the point of them being asynchronous?
