調用API之後不等待響應

Question

問題是我調用megnto api，但是當api在所有其他語句執行之前返回對象時。

NSMutableArray *list=[Magento.service startSession]; 

    NSLog(@"Record is:%@",list); 

，我已經修改了

startSession方法是：

- (NSMutableArray *)startSession 
{ 
NSString *_sessionID; 
    NSNumber *nsPage =[NSNumber numberWithInt:1]; 
    NSNumber *nsData =[NSNumber numberWithInt:10]; 
    NSMutableArray *listOfName = [[NSMutableArray alloc] init]; 
    NSArray *args = [NSArray arrayWithObjects:nsPage,nsData,nil ]; 
    @synchronized(self) { 
    _sessionID = sessionID; 
} 
if (_sessionID != FAILED_SESSION) 
    dispatch_group_enter(session_group); 
[client postPath:@"login" parameters:@{@"username": MAGENTO_USERNAME, @"apiKey": MAGENTO_API_KEY} success:^(AFHTTPRequestOperation *operation, id responseObject) { 
    sessionID = responseObject; 



    dispatch_group_leave(session_group); 

     [client postPath:@"call" parameters:@{@"sessionId":sessionID, @"resourcePath":@"callforprice_collection.getCallForPriceCollection", 
     @"args":args 
     } success:^(AFHTTPRequestOperation *operationData, id responseData) { 

      NSLog(@"Response : %@",responseData); 
      [listOfName addObject:[responseData valueForKey:@"name"]]; 

     } failure:^(AFHTTPRequestOperation *operationData, NSError *error) { 
      NSLog(@"Response is not get"); 
      sessionID = FAILED_SESSION; 
     }]; 


     NSLog(@"got session %@", sessionID); 
} failure:^(AFHTTPRequestOperation *operation, NSError *error) { 
    sessionID = FAILED_SESSION; 
}]; 
    return listOfName; 

} 

O/P是

2013-05-03 06:27:16.272 CallForPrice[3120:c07] Record is:() 
2013-05-03 06:27:19.836 CallForPrice[3120:c07] got session 88ef34087a12809334ae3a0c839f85b6 
** response that i have printed in method** 
2013-05-03 06:27:22.048 CallForPrice[3120:c07] Response : (
     { 
     "callforprice_id" = 13; 
     country = Austria; 
     "created_time" = "2013-05-03 12:03:05"; 
     emailid = "indies.tester@gmail.com"; 
     message = hfhftrfygjh; 
     name = "Richard Conover"; 
     "phone_no" = 8977896; 
     "product_name" = Ottoman; 
     "product_options" = ""; 
     "update_time" = "0000-00-00 00:00:00"; 
    }, 
     { 
     "callforprice_id" = 12; 
     country = "Antigua and Barbuda"; 
     "created_time" = "2013-05-03 12:01:24"; 
     emailid = "indies.tester@gmail.com"; 
     message = sdfsdfsdfwe; 
     name = "Richard Conover"; 
     "phone_no" = 5645; 
     "product_name" = Ottoman; 
     "product_options" = ""; 
     "update_time" = "0000-00-00 00:00:00"; 
    }, 
     { 
     "callforprice_id" = 11; 
     country = Angola; 
     "created_time" = "2013-05-03 11:58:51"; 
     emailid = "indies.tester@gmail.com"; 
     message = 6tyrtyryrty; 
     name = "Kaitlyn Matheson"; 
     "phone_no" = 564564; 
     "product_name" = Ottoman; 
     "product_options" = ""; 
     "update_time" = "0000-00-00 00:00:00"; 
    }, 

startSession實際顯示記錄什麼發生是的NSLog被調用之前做印刷迴應。如何解決這個problem.s

Answer 1

1）所有進口後，加入這一行Magento.h

typedef void(^completion)(NSArray *list); 

2）改變方法簽名，無論是在h和.M

- (void)startSession:(completion) completion 

3）Magento.m，修改方法與此

- (void)startSession:(completion) completion 
{ 

     NSString *_sessionID; 
     NSNumber *nsPage =[NSNumber numberWithInt:1]; 
     NSNumber *nsData =[NSNumber numberWithInt:10]; 
     NSMutableArray *listOfName = [[NSMutableArray alloc] init]; 
     NSArray *args = [NSArray arrayWithObjects:nsPage,nsData,nil ]; 
     @synchronized(self) { 
      _sessionID = sessionID; 
     } 
     if (_sessionID != FAILED_SESSION) 
      dispatch_group_enter(session_group); 
     [client postPath:@"login" parameters:@{@"username": MAGENTO_USERNAME, @"apiKey": MAGENTO_API_KEY} success:^(AFHTTPRequestOperation *operation, id responseObject) { 
      sessionID = responseObject; 



      dispatch_group_leave(session_group); 

      [client postPath:@"call" parameters:@{@"sessionId":sessionID, @"resourcePath":@"callforprice_collection.getCallForPriceCollection", 
      @"args":args 
      } success:^(AFHTTPRequestOperation *operationData, id responseData) { 

       NSLog(@"Response : %@",responseData); 
       [listOfName addObject:[responseData valueForKey:@"name"]]; 

       completion(listOfName); 

      } failure:^(AFHTTPRequestOperation *operationData, NSError *error) { 
       NSLog(@"Response is not get"); 
       sessionID = FAILED_SESSION; 
       completion(nil); 
      }]; 


      NSLog(@"got session %@", sessionID); 
     } failure:^(AFHTTPRequestOperation *operation, NSError *error) { 
      sessionID = FAILED_SESSION; 
      completion(nil); 
     }]; 

} 

4）在viewController.h，聲明一個全局變量保持返回的名稱，

@property(nonatomic, strong) NSArray *nameList; 

// and in viewDidLoad method, 
self.nameList = [[NSArray alloc] init]; 

5）把這個代碼片段，在viewDidLoad中或

[Magento.service startSession:^(NSArray *list) { 
    if(list){ 
     self.nameList = list; 
     [self.tableView reloadData]; 
    }else self.nameList = [[NSArray alloc] init]; 
}]; 

6）使用self.nameList陣列加載該表

Answer 2

的Alloc所述的NSMutableArray第一和確保[Magento的.service renewSession]實際返回一個數組。

NSMutableArray *list = [NSMutableArray array]; 
list=[Magento.service renewSession]; 
//[Magento.service getCallForPriceData]; 
NSLog(@"Record is:%@",list); 

Answer 3

我不知道Magneto API，但我遇到過這種行爲。這是一種異步方法。在startSession中，它將返回空列表，並進行異步調用（在不同的線程上）。而在迴應中，你對結果無能爲力。 （塊存儲本地引用，這就是爲什麼你可以添加一些東西）。試圖定義一個

startSessionWithCompletionBlock:(void(^)(NSArray* list))completionBlock; 

功能和變化的響應處理程序：

NSLog(@"Response : %@",responseData); 
[listOfName addObject:[responseData valueForKey:@"name"]]; 
completionBlock(listOfName); 

，並呼籲

[Magento.service startSessionWithCompletionBlock:^(NSArray* list){ 
    NSLog(@"Record is:%@",list); 
}]; 

這樣只會把第一個對象列表中，並使其返回（只是以顯示它實際返回的東西）。您需要定義一些邏輯來計算異步下載項目。