拿到 NSOperation取消单个网络请求,operation 直接取消:[operation cancel];

用get函数作为例子来说明怎么取消当前的网络请求
++ (AFHTTPRequestOperation *)getJSONDataWithUrlPath:(NSString *)url_path parameters:(id)parameters success:(void (^)(id json))success fail:(void (^)())fail { AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager]; NSString* urlStr = [NSString stringWithFormat:@"%@%@", IP_STR, url_path]; __block AFHTTPRequestOperation* http_operation; AFHTTPRequestOperation* operation = [manager GET:urlStr parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) { if (success) { http_operation = operation; success(responseObject); } } failure:^(AFHTTPRequestOperation *operation, NSError *error) { NSLog(@"请求失败，错误信息：error==%@", error); if (fail) { http_operation = operation; fail(); } }]; return operation; }

取消所有的 operation --

[[MGJRequestManager sharedInstance] cancelAllRequest];
- (void)cancelAllRequest
{
    [self.requestManager.operationQueue cancelAllOperations];
}

取消某个URL的请求

- (void)cancelHTTPOperationsWithMethod:(NSString *)method url:(NSString *)url
{
    NSError *error;
    
    NSString *pathToBeMatched = [[[self.requestManager.requestSerializer requestWithMethod:method URLString:[[NSURL URLWithString:url] absoluteString] parameters:nil error:&error] URL] path];
    
    for (NSOperation *operation in [self.requestManager.operationQueue operations]) {
        if (![operation isKindOfClass:[AFHTTPRequestOperation class]]) {
            continue;
        }
        BOOL hasMatchingMethod = !method || [method  isEqualToString:[[(AFHTTPRequestOperation *)operation request] HTTPMethod]];
        BOOL hasMatchingPath = [[[[(AFHTTPRequestOperation *)operation request] URL] path] isEqual:pathToBeMatched];
        
        if (hasMatchingMethod && hasMatchingPath) {
            [operation cancel];
        }
    }
}