Question

我在Objective-C中设置了AFNetworking的JSON帖子，并使用以下代码将数据发送到服务器：

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
NSDictionary *parameters = @{@"name": deviceName, @"model": modelName, @"pin": pin};
manager.requestSerializer = [AFJSONRequestSerializer serializer];
[manager.requestSerializer setValue:@"Content-Type" forHTTPHeaderField:@"application/json"];
[manager POST:@"SENSORED_OUT_URL" parameters:parameters

success:^(AFHTTPRequestOperation *operation, id responseObject)
{
    NSLog(@"JSON: %@", responseObject);
}

failure:^(AFHTTPRequestOperation *operation, NSError *error)
{
    NSLog(@"Error: %@", error);
}];

我通过相同的请求收到信息，并希望将数据发送到NSString。我将如何使用AFNetworking？

进行此操作

Answer 1

responseObject是NSArray或NSDictionary。您可以使用isKindOfClass:在运行时检查：

if ([responseObject isKindOfClass:[NSArray class]]) {
    NSArray *responseArray = responseObject;
    /* do something with responseArray */
} else if ([responseObject isKindOfClass:[NSDictionary class]]) {
    NSDictionary *responseDict = responseObject;
    /* do something with responseDict */
}

如果你真的需要JSON的字符串，可以查看operation.responseString。

Answer 2

在这种情况下，当网络服务以JSON回复时，AFNetworking将为您执行序列化，而responseObject很可能是NSArray或NSDictionary对象。

这样的对象应该比JSON内容的字符串更有用。

Answer 3

在我的情况下，它看起来像（也许它可以帮助）

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

manager.requestSerializer = [AFJSONRequestSerializer serializer];
[manager POST:url parameters:params
      success:^(AFHTTPRequestOperation *operation, id responseObject) {
          NSDictionary *jsonDict = (NSDictionary *) responseObject;
          //!!! here is answer (parsed from mapped JSON: {"result":"STRING"}) ->
          NSString *res = [NSString stringWithFormat:@"%@", [jsonDict objectForKey:@"result"]];
      } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
          //....
      }
 ];

检查响应对象的类型（如https://stackoverflow.com/a/21962445/3628317回答）

也很棒

Answer 4

我觉得最好将AFHTTPClient子类化为：

//  MyHTTPClient.h

#import <AFNetworking/AFHTTPClient.h>

@interface MyHTTPClient : AFHTTPClient

+ (instancetype)sharedClient;

@end

//  MyHTTPClient.m

#import "MyHTTPClient.h"

#import <AFNetworking/AFJSONRequestOperation.h>

static NSString *kBaseUrl = @"http://api.blah.com/yada/v1/";

@implementation MyHTTPClient

+ (instancetype)sharedClient {
    static id instance;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        instance = [[self alloc] init];
    });
    return instance;
}

- (id)init {
    if (self = [super initWithBaseURL:[NSURL URLWithString:kBaseUrl]]) {
        self.parameterEncoding = AFJSONParameterEncoding;

        [self setDefaultHeader:@"Accept" value:@"application/json"]; // So AFJSONRequestOperation becomes eligible for requests.
        [self registerHTTPOperationClass:[AFJSONRequestOperation class]]; // So that it gets used for postPath etc.
    }
    return self;
}

@end

重要的一点是：

以AFJSONRequestOperation符合条件的方式设置“接受”。
将AFJSONRequestOperation添加到http操作类。

然后你可以像这样使用它：

#import "MyHTTPClient.h"

@implementation UserService

+ (void)createUserWithEmail:(NSString *)email completion:(CreateUserCompletion)completion {
    NSDictionary *params = @{@"email": email};
    [[MyHTTPClient sharedClient] postPath:@"user" parameters:params success:^(AFHTTPRequestOperation *operation, NSDictionary *responseObject) {
        completion([responseObject[@"userId"] intValue], YES);
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        completion(0, NO);
    }];
}

@end

这样做的好处在于，您的responseObject会自动被JSON解析为字典（或数组）。很干净。

（这是针对afnetworking 1.x）

使用AFNetworking解析JSON响应

4 个答案: