ios - AFNetworking 未实现

Question

AFHTTPRequestOperationManager 有这个实现:

 - (AFHTTPRequestOperation *)HTTPRequestOperationWithRequest:(NSURLRequest *)request
                                                success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
                                                failure:(void (^)(AFHTTPRequestOperation         *operation, NSError *error))failure
 {
     AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
     operation.responseSerializer = self.responseSerializer;
     operation.shouldUseCredentialStorage = self.shouldUseCredentialStorage;
     operation.credential = self.credential;
     operation.securityPolicy = self.securityPolicy;

     [operation setCompletionBlockWithSuccess:success failure:failure];

     return operation;
 }

当使用这个方法时，成功和失败 block 永远不会被调用。在我将这一行放入实现之后:

[self.operationQueue addOperation:operation];

它有效。为什么 AFNetworking 2.0 AFHTTPRequestOperationManager 错过这一行或者我只是不明白这个方法？谢谢。

Answer 1

HTTPRequestOperationWithRequest 创建一个操作，但不执行它。当您将操作添加到您使用此调用创建的操作队列时:

[self.operationQueue addOperation:operation];

您实际上是在执行刚刚创建的操作。然后将调用成功和失败 block 。