使用 AFNetworking 处理异步 POST json 请求

Posted 2023-02-24

【中文标题】使用 AFNetworking 处理异步 POST json 请求

【英文标题】：Using AFNetworking for asynchronous POST json requests

【发布时间】：2013-03-08 09:33:42

【问题描述】：

我一直在尝试通过 AFNetworking 使用 POST json。经过一番研究，我终于得到了这个工作

- (IBAction)go:(id)sender 
    //Some POST
    AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:[NSURL URLWithString:@"https://www.test.com/"]];
    [httpClient setParameterEncoding:AFJSONParameterEncoding];
    NSMutableURLRequest *request = [httpClient requestWithMethod:@"POST"
                                                            path:@"https://www.test.com/user/login/"
                                                      parameters:@@"username":self.username.text, @"password":self.password.text];
    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
    [httpClient registerHTTPOperationClass:[AFHTTPRequestOperation class]];
    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) 
        // Print the response body in text
        NSDictionary *jsonDict = (NSDictionary *) responseObject;
        BOOL *success = [[jsonDict objectForKey:@"success"] boolValue];
        NSLog(@"Response: %@", [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding]);
     failure:^(AFHTTPRequestOperation *operation, NSError *error) 
        NSLog(@"Error: %@", error);
    ];
    [operation start];

这对于演示来说很好，但现在我想最终使用 NSDirectory 来拆分我的 json 对象，所以我尝试做这样的事情，但是每当我点击按钮时我的应用程序就会崩溃

- (IBAction)go:(id)sender 
    //Some POST
    AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:[NSURL URLWithString:@"https://www.test.com/"]];
    [httpClient setParameterEncoding:AFJSONParameterEncoding];
    NSMutableURLRequest *request = [httpClient requestWithMethod:@"POST"
                                                            path:@"https://www.test.com/user/login/"
                                                      parameters:@@"username":self.username.text, @"password":self.password.text];
    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
    [httpClient registerHTTPOperationClass:[AFHTTPRequestOperation class]];
    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) 
        // Print the response body in text
        NSDictionary *jsonDict = (NSDictionary *) responseObject;
        BOOL success = [[jsonDict objectForKey:@"success"] boolValue];
        if (success) 
            NSLog(@"yes!!!");
        else
            NSString *reason = [jsonDict objectForKey:@"reason"];
            NSLog(@"reason: %@",reason);
        
     failure:^(AFHTTPRequestOperation *operation, NSError *error) 
        NSLog(@"Error: %@", error);
    ];
    [operation start];

错误

2013-03-08 03:27:34.648 test[18253:c07] -[__NSCFData objectForKey:]: unrecognized selector sent to instance 0x888a6b0
2013-03-08 03:27:34.648 test[18253:c07] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFData objectForKey:]: unrecognized selector sent to instance 0x888a6b0'
*** First throw call stack:
(0x1ce0012 0x111de7e 0x1d6b4bd 0x1ccfbbc 0x1ccf94e 0x24608 0x12e71 0x4a4453f 0x4a56014 0x4a467d5 0x1c86af5 0x1c85f44 0x1c85e1b 0x1c3a7e3 0x1c3a668 0x61ffc 0x21ad 0x20d5)
libc++abi.dylib: terminate called throwing an exception

【参考方案1】：

您使用的是AFHTTPRequestOperation，而不是AFJSONRequestOperation。

您也可以直接使用AFHttpClient：

NSDictionary *parameter = @@"username":self.username.text, @"password":self.password.text;
[httpClient setParameterEncoding:AFJSONParameterEncoding];
[httpClient registerHTTPOperationClass:[AFJSONRequestOperation class]];

[httpClient postPath:@"api/v1/user/login/" parameters:parameter success:^(AFHTTPRequestOperation *operation, id responseObject) 
    // Print the response body in text
    BOOL *success = [[responseObject objectForKey:@"success"] boolValue];
    NSLog(@"Response: %@",responseObject);
 failure:^(AFHTTPRequestOperation *operation, NSError *error) 
    [self handleConnectionError:error];
];

我还建议使用clientWithBaseURL: 方法创建一个仅创建AFHTTPClient 的一个实例。

【讨论】：

rckoenes，那是因为这是我能找到的唯一帖子示例。如果你不介意，你能详细说明一下吗？应该对现有代码进行哪些更改？

另请阅读github.com/AFNetworking/AFNetworking 上的文档，它确实解释了如何正确使用AFHTTPClient。看看AFAppDotNetAPIClient，这将为您提供如何使用AFHTTPClient 的一个很好的例子。

非常感谢 rckoenes。但什么是handleConnectionError？另外，我不需要[操作开始]；不再？这个方法也是异步的吗？

handleConnectionError: 是我自己创建的方法，这样的方法将处理NSError 并向用户显示消息。是的，这些方法是异步的。

好的，这是有道理的。但我只是测试了这段代码。它给了我与上面的代码相同的错误

【参考方案2】：

我试图发送 JSON 对象并取回 JSON 数据并解析它

NSURL *url = [NSURL URLWithString:@"https://MySite.com/"];
AFHTTPClient *httpClient = [[AFHTTPClient alloc]initWithBaseURL:url];
//[httpClient setParameterEncoding:AFJSONParameterEncoding];
//[httpClient registerHTTPOperationClass:[AFJSONRequestOperation class]];

NSDictionary *params = [NSDictionary dictionaryWithObjectsAndKeys:
                        @"Ans", @"name",
                        @"29",  @"age", nil];
NSMutableURLRequest *request = [httpClient requestWithMethod:@"POST"
                                                        path:@"/testJSONReturn.php"
                                                  parameters:params];
AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) 
    NSLog(@"DATA: %@", [JSON valueForKeyPath:@"data"]);
 failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) 
    NSLog(@"Request Failure Because %@",[error userInfo]);
];

[operation start];

可能有帮助

【参考方案3】：

使用 AFHTTPRequestOperationManager，您将添加您的请求管理器，在我的情况下，我已经使用 NSdictionnary 作为参数完成了一个 POST 方法

[manager GET:url parameters:parameters success:success failure:failure];

通过这一行，您可以选择您的方法 / GET 或 POST

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
NSDictionary *parameters= dic;
NSMutableString *url = [[NSMutableString alloc] init];
[url appendString: RootObj.root];
    [url appendString:@"/yourURL/"];
manager.requestSerializer=[AFHTTPRequestSerializer serializer];
manager.responseSerializer = [AFJSONResponseSerializer serializer];

[manager POST:url parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) 
 failure:^(AFHTTPRequestOperation *operation, NSError *error)       
];

【讨论】：

请编辑您的答案，并解释这是如何解决问题的。

【参考方案4】：

另一种方法，使用 AFHTTPRequestOperation：

NSString* path = "http://www.test.com/file.php";
NSMutableURLRequest* request = [NSURLRequest requestWithURL:[NSURL URLWithString:path]];
//request.HTTPMethod = @"GET";
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc]initWithRequest:request];
//operation.responseSerializer = [AFJSONResponseSerializer serializer];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) 
    NSLog(@"success: %@", operation.responseString);
 failure:^(AFHTTPRequestOperation *operation, NSError *error) 
    NSLog(@"error: %@",  operation.responseString);
];
[operation start];