在循環內部運行中運行請求操作

Question

如何在1請求的成功塊內部運行多個請求並等待它完成？

[manager GET:url parameters:params success:^(AFHTTPRequestOperation *operation, id responseObject) { 
    NSLog(@"%@ Response: \n%@", url, responseObject); 
    resultsArray = [[NSMutableArray alloc] init]; 
    for (NSDictionary *json in [responseObject objectForKey:@"items"]) { 
     [self getDetails:json]; 
    } 

} failure:^(AFHTTPRequestOperation *operation, NSError *error) { 
    [SVProgressHUD dismiss]; 
}]; 

凡getDetails：（ID）JSON是加載的組，其參數是基於主請求的結果的請求的方法。

例如： 我想從API請求學生列表，然後在成功塊上。對於每個學生，我想從另一個表（另一個請求）獲取相關數據並將它們放在我的NSObject上。

EDIT這是我的getDetails方法

- (AFHTTPRequestOperation *)getDetails:(NSDictionary *)json 
{ 
    NSLog(@"Start Op %@",[json objectForKey:@"related_salon"]); 
    NSString *url = [NSString stringWithFormat:@"%@read/salons/%@",SERVER_API_URL,[json objectForKey:@"related_salon"]]; 
    NSURLRequest *req = [NSURLRequest requestWithURL:[NSURL URLWithString:url]]; 
    AFHTTPRequestOperation *op = [[AFHTTPRequestOperation alloc] initWithRequest:req]; 
    //op.responseSerializer = [AFJSONResponseSerializer serializer]; 
    [op setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { 
     NSLog(@"Success %@",[json objectForKey:@"name"]); 

    } failure:^(AFHTTPRequestOperation *operation, NSError *error) { 
     NSLog(@"Failed Op %@",error.localizedDescription); 
    }]; 
    //AFHTTPRequestOperation *op = [[AFHTTPRequestOperation alloc] initWithRequest:req]; 
    //op.responseSerializer = [AFJSONResponseSerializer serializer]; 
    [op start]; 
    return op; 
} 

Answer 1

的AFNetworking GET方法返回一個ATHTTPRequestOperation（一個NSOperation子類）。你可以讓你的getDetails方法返回該對象。然後，您可以創建依賴於這些操作，其中你會在結束時運行的新操作：

NSOperation *completionOperation = [NSBlockOperation blockOperationWithBlock:^{ 
    // add here whatever you want to perform when all the getDetails calls are done, 
    // e.g. maybe you want to dismiss your HUD when all the requests are done. 
    [SVProgressHUD dismiss]; 
}]; 

[manager GET:url parameters:params success:^(AFHTTPRequestOperation *operation, id responseObject) { 
    NSLog(@"%@ Response: \n%@", url, responseObject); 
    resultsArray = [[NSMutableArray alloc] init]; 
    for (NSDictionary *json in [responseObject objectForKey:@"items"]) { 
     NSOperation *operation = [self getDetails:json]; 
     [completionOperation addDependency:operation]; 
    } 

    [[NSOperationQueue mainQueue] addOperation:completionOperation]; 
} failure:^(AFHTTPRequestOperation *operation, NSError *error) { 
    [SVProgressHUD dismiss]; 
}]; 

再次，這是假設該getDetails是做自己的GET調用，您更改getDetails到（一）捕獲由GET返回的NSOperation和（b）返回它。