Strange Delay to Update TextField

Question

Im getting Facebook User Data to auto completing signup textfields.

Problem: I did a test and NSLog returns information quickly, but to update the TextFields.text it\'s

Answer 1

You need to perform UI updates on the main thread. Your completion handler is being called on a background thread.

[meRequest performRequestWithHandler:^(NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *error) {

    if (!error) {
        NSDictionary *resultsDictionary = [responseData objectFromJSONData];

        NSLog(@"%@", [resultsDictionary objectForKey:@"name"]);

        // The problem is here. While NSLog runs in seconds showing Facebook User Name, the textfiend.text updates take about 10 seconds longer.

        // Ensure UI updated on main queue
        dispatch_async(dispatch_get_main_queue(), ^{
            _tfName.text = [resultsDictionary objectForKey:@"name"];
            _tfEmail.text = [resultsDictionary objectForKey:@"email"];
            _tfGender.text = [resultsDictionary objectForKey:@"gender"];
            _tfBirthday.text = [resultsDictionary objectForKey:@"birthday"];
        });
    }

}];