TextField 업데이트에 이상한 지연이 있습니다.

Question

Facebook 사용자 데이터가 가입 텍스트 필드 자동 완성을 받고 있습니다.

문제점 : 테스트를 수행하고 NSLog가 정보를 빠르게 반환하지만 TextFields.text를 업데이트하는 것이 지연됩니다.

---

코드 :

- (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

당신은 주 스레드에서 UI 업데이트를 수행 할 필요가있다. 완성 처리기가 백그라운드 스레드에서 호출되고 있습니다.

[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"]; 
     }); 
    } 

}];