iphone - 调用 API 后不等待响应

Question

问题是我正在调用 megnto api，但是当 api 返回对象之前，所有其他语句都已执行。

NSMutableArray *list=[Magento.service startSession];

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

我修改的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 正在显示记录，实际发生的是 NSLOG 在调用 do response 之前打印。如何解决这个问题.s

Answer 1

1) 在 Magento.h 中的所有导入之后添加这一行

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

2) 更改.h 和.m 中的方法签名

- (void)startSession:(completion) completion

3) 在 Magento.m 中，用这个修改你的方法

- (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)在你的 viewController.h 中，声明一个全局变量来保存返回的名称，

@property(nonatomic, strong) NSArray *nameList;

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

5) 把这个代码片段，放在 viewDidLoad 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数组加载表格