ios - 使用 AFNetworking 进行异步 POST json 请求

Question

我一直在尝试使用 AFNetworking 来使用 POST json。经过一些研究，我终于让这个工作了

- (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];
}

这对于演示目的来说很好，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

Answer 1

您正在使用 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: 方法只创建一个 AFHTTPClient 实例。