调用API之后不等待响应

问题描述：

问题是我调用megnto api，但是当api在所有其他语句执行之前返回对象时。调用API之后不等待响应

NSMutableArray *list=[Magento.service startSession]; 

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

，我已经修改了

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 = "[email protected]"; 
     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 = "[email protected]"; 
     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 = "[email protected]"; 
     message = 6tyrtyryrty; 
     name = "Kaitlyn Matheson"; 
     "phone_no" = 564564; 
     "product_name" = Ottoman; 
     "product_options" = ""; 
     "update_time" = "0000-00-00 00:00:00"; 
    },

startSession实际显示记录什么发生是的NSLog被调用之前做印刷回应。如何解决这个problem.s

因为它是在不同线程上运行的renewSession – 2013-05-03 12:59:56

为什么这条线被注释掉了？ – Undo 2013-05-03 13:00:00

答

1）所有进口后，加入这一行Magento.h

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

2）改变方法签名，无论是在h和.M

- (void)startSession:(completion) completion

3）Magento.m，修改方法与此

- (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，声明一个全局变量保持返回的名称，

@property(nonatomic, strong) NSArray *nameList; 

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

5）把这个代码片段，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阵列加载该表

我有一个问题，我怎样才能将参数传递给startSession方法 – UnderGround 2013-05-08 07:58:17

哪种类型的参数是我的朋友？如果它是一个字符串，你可以使用这种方法， - （void）startSession：（完成）完成withString：（NSString *）inputString – 2013-05-08 08:12:03

谢谢亲爱的！我虽然使用完成块后，我们无法传递任何其他参数，所以我很傻。感谢您快速重播。并感谢你我即将完成我的申请。 – UnderGround 2013-05-08 08:16:17

答

的Alloc所述的NSMutableArray第一和确保[Magento的.service renewSession]实际返回一个数组。

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

问题不是这样，但我调用不同的方法，而不是我已修改，但仍然给出的响应为零并且结果为 – UnderGround 2013-05-03 13:35:21

在renewSession方法上放置一个断点，并确保它实际上是首先创建数组。你说你修改了这个方法来返回一个数组，所以这个问题的可能性更大。 – 2013-05-03 13:39:00

答

我不知道Magneto API，但我遇到过这种行为。这是一种异步方法。在startSession中，它将返回空列表，并进行异步调用（在不同的线程上）。而在回应中，你对结果无能为力。（块存储本地引用，这就是为什么你可以添加一些东西）。试图定义一个

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

功能和变化的响应处理程序：

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

，并呼吁

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

这样只会把第一个对象列表中，并使其返回（只是以显示它实际返回的东西）。您需要定义一些逻辑来计算异步下载项目。

调用API之后不等待响应

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