未知类型名称AFJSONRequestOperation

我目前正在通过this tutorial。我已经安装了AFNetworking，但是当我输入此代码时，我在第7行和第8行发现错误，说明Unknown type name AFJSONRequestOperation和No known class method for selector JSONRequestOperationWithRequest:request。未知类型名称AFJSONRequestOperation

-(void)makeRestuarantRequests 
{ 
    NSURL *url = [NSURL URLWithString:@"A URL which returns JSON"]; 

NSURLRequest *request = [NSURLRequest requestWithURL:url]; 
//AFNetworking asynchronous url request 
AFJSONRequestOperation *operation = [AFJSONRequestOperation 
          JSONRequestOperationWithRequest:request 
          success:^(NSURLRequest *request, NSHTTPURLResponse *response, id responseObject) 
            { 
             NSLog(@"JSON RESULT %@", responseObject); 

            } 
          failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id responseObject) 
            { 
              NSLog(@"Request Failed: %@, %@", error, error.userInfo); 
            }]; 

[operation start]; 

}

看来，我有一个文件丢失，其中包含一类，我需要，也许是AFJSONRequestOperation.m和.h。

修复的任何想法？

编辑：

原AFNetworking download所有.h文件已通过AFNetworking.h被导入：

#import <Foundation/Foundation.h> 
#import <Availability.h> 

#ifndef _AFNETWORKING_ 
    #define _AFNETWORKING_ 

    #import "AFURLRequestSerialization.h" 
    #import "AFURLResponseSerialization.h" 
    #import "AFSecurityPolicy.h" 
    #import "AFNetworkReachabilityManager.h" 

    #import "AFURLConnectionOperation.h" 
    #import "AFHTTPRequestOperation.h" 
    #import "AFHTTPRequestOperationManager.h" 


#if ((defined(__MAC_OS_X_VERSION_MAX_ALLOWED) && __MAC_OS_X_VERSION_MAX_ALLOWED >= 1090) || \ 
     (defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 70000)) 
    #import "AFURLSessionManager.h" 
    #import "AFHTTPSessionManager.h" 
#endif 

#endif /* _AFNETWORKING_ */

来源

2014-01-22 Sebastian

你错过了一个'＃import' ... – trojanfoe

所有这些文件都被导入：https：//github.com/AFNetworking/AFNetworking/tree/master/AFNetworking正如我所说的，必须有一些缺失 – Sebastian

全部他们？听起来有点矫枉过正。 – trojanfoe