一個接一個地調用兩個NSURLSessionTask完成塊？

Question

我有以下設置使用AFNetworking撥打我的服務器。我使用了一個我在互聯網上找到的例子來包含一個完成模塊，以便知道何時完成了呼叫。

文件 「FCEngine.m」

- (void)fetchBusinessProfile:(NSString *)userID userAccessToken:(NSString *)userAccessToken completion:(void (^)(NSDictionary *json, BOOL success))completion { 

/// Validate the user token again the user id. 

NSDictionary *parameters = [[NSDictionary alloc]initWithObjectsAndKeys:userAccessToken,@"user_access_token", 
          userID,@"user_id", 
          nil]; 


AFHTTPSessionManager *manager = [AFHTTPSessionManager manager]; 

AFHTTPRequestSerializer *serializer = [AFHTTPRequestSerializer serializer]; 
manager.requestSerializer = serializer; 

manager.responseSerializer = [AFJSONResponseSerializer serializerWithReadingOptions:NSJSONReadingAllowFragments]; 

[manager POST:@"" parameters:parameters progress:nil success:^(NSURLSessionTask *task, id responseObject) { 

    NSLog(@"JSON Business Profile: %@", responseObject); 

    fetchBusinessProfileCompletion(responseObject, YES); 

} failure:^(NSURLSessionTask *operation, NSError *error) { 

    //NSLog(@"Error: %@", error); 

    NSMutableDictionary *errorResponse = [[NSMutableDictionary alloc] init]; 

    [errorResponse setObject:@"connection_error" forKey:@"state"]; 
    [errorResponse setObject:[error localizedDescription] forKey:@"description"]; 

    fetchBusinessProfileCompletion(errorResponse, YES); 

}]; 

} 

- (void)fetchNotifications:(NSString *)userID userAccessToken:(NSString *)userAccessToken completion:(void (^)(NSDictionary *json, BOOL success))completion { 

/// Validate the user token again the user id. 

NSDictionary *parameters = [[NSDictionary alloc]initWithObjectsAndKeys:userAccessToken,@"user_access_token", 
          userID,@"user_id", 
          nil]; 


AFHTTPSessionManager *manager = [AFHTTPSessionManager manager]; 

AFHTTPRequestSerializer *serializer = [AFHTTPRequestSerializer serializer]; 
manager.requestSerializer = serializer; 

manager.responseSerializer = [AFJSONResponseSerializer serializerWithReadingOptions:NSJSONReadingAllowFragments]; 

[manager POST:@"" parameters:parameters progress:nil success:^(NSURLSessionTask *task, id responseObject) { 

    //NSLog(@"JSON: %@", responseObject); 

    completion(responseObject, YES); 

} failure:^(NSURLSessionTask *operation, NSError *error) { 

    //NSLog(@"Error: %@", error); 

    NSMutableDictionary *errorResponse = [[NSMutableDictionary alloc] init]; 

    [errorResponse setObject:@"connection_error" forKey:@"state"]; 
    [errorResponse setObject:[error localizedDescription] forKey:@"description"]; 

    completion(errorResponse, YES); 

}]; 


} 

我怎麼打這個電話上主視圖控制器

- (void)MyMethods { 

[self.fcEngine fetchBusinessProfile:userID userAccessToken:userAccessToken completion:^(NSDictionary *json, BOOL success) { 

    /// Response here 


}]; 

[self.fcEngine fetchNotifications:self.userID userAccessToken:self.userAccessToken completion:^(NSDictionary *json, BOOL success) { 

     //// Response here 

}]; 

} 

現在的問題是，2個呼叫是由以下是一個接一個，並且當我爲一個數據獲取數據時「fetchBusinessProfile」上的競爭塊被稱爲。

我是否設置錯了？如果有2個或更多的電話，我只想要完成這個特定的區塊而不是全部。

Answer 1

我不認爲你理解異步以及完成塊。如果您按上述定義進行2個網絡呼叫，則可以按任意順序進行。 completion在fetchBusinessProfile和fetchNotifications將是不同完成塊... 除非你讓他們一樣。

例如：

[self.fcEngine fetchBusinessProfile:userID userAccessToken:userAccessToken completion:^(NSDictionary *json, BOOL success) { 

    /// Handle response 
    // Note calling the SAME completion block 
    sameCompletionBlockAlreadyDefined(); 


}]; 

[self.fcEngine fetchNotifications:self.userID userAccessToken:self.userAccessToken completion:^(NSDictionary *json, BOOL success) { 

    //// Handle response 
    // Note calling the SAME completion block 
    sameCompletionBlockAlreadyDefined(); 

}]; 

在這種情況下，sameCompletionBlockAlreadyDefined()是一些已定義塊。在這種情況下，每個呼叫的塊體的確是，但漏斗通過sameCompletionBlockAlreadyDefined相同的呼叫。您可能會感到困惑，因爲completion恰好在您的第一個片段中被命名爲相同。

注意你的問題真的很差，所以它不完全清楚你的意思。

更大的問題是你的目標是什麼？最後只需要調用一個完成塊？或者你想完全不同的完成塊？兩者需要不同的技術。清楚你的目標是什麼。

前者將是最好的服務與dispatch_group。後者需要不同的完成塊。

調度組的一個例子是這樣的：

dispatch_group_t group = dispatch_group_create(); 

dispatch_group_enter(group); 

[self.fcEngine fetchBusinessProfile:userID userAccessToken:userAccessToken completion:^(NSDictionary *json, BOOL success) { 

    /// Handle response 
    dispatch_group_leave(group); 


]; 

self.fcEngine fetchNotifications:self.userID userAccessToken:self.userAccessToken completion:^(NSDictionary *json, BOOL success) { 

    //// Handle response 
    dispatch_group_leave(group); 

}]; 

dispatch_group_wait(group, DISPATCH_TIME_FOREVER); 

// This would be some completion block which means all is done 
completion();