iOS obj-c: POST data super slow? [duplicate] - ios

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 delaying.
Code:
- (IBAction)facebookProfile:(id)sender {
if(!_accountStore)
_accountStore = [[ACAccountStore alloc] init];
ACAccountType *facebookTypeAccount = [_accountStore accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierFacebook];
[_accountStore requestAccessToAccountsWithType:facebookTypeAccount
options:#{ACFacebookAppIdKey: #"417425124162461", ACFacebookPermissionsKey: #[#"email"]}
completion:^(BOOL granted, NSError *error) {
if(granted){
NSArray *accounts = [_accountStore accountsWithAccountType:facebookTypeAccount];
_facebookAccount = [accounts lastObject];
NSLog(#"Success");
[self me];
}else{
// ouch
NSLog(#"Fail");
NSLog(#"Error: %#", error);
}
}];
}
- (void)me {
NSURL *meUrl = [NSURL URLWithString:#"https://graph.facebook.com/me"];
SLRequest *meRequest = [SLRequest requestForServiceType:SLServiceTypeFacebook requestMethod:SLRequestMethodGET URL:meUrl parameters:nil];
meRequest.account = _facebookAccount;
[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.
_tfName.text = [resultsDictionary objectForKey:#"name"];
_tfEmail.text = [resultsDictionary objectForKey:#"email"];
_tfGender.text = [resultsDictionary objectForKey:#"gender"];
_tfBirthday.text = [resultsDictionary objectForKey:#"birthday"];
}
}];
}

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"];
});
}
}];