ios AFNetworking 2.0 - 使用 responseObject 作为 NSDictionary
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AFNetworking 2.0 - use responseObject as NSDictionary
提问by Brian
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
[manager GET:@"http://example.com/resources.json" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSLog(@"JSON: %@", responseObject);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"Error: %@", error);
}];
this is the recommended wayto send GETrequest in AFNetworking 2.0. I want to get the value of a specific key in the json, so I want to use responseObjectas NSDictionary. this is what I was trying:
这是在 AFNetworking 2.0 中推荐的发送GET请求的方式。我想获取 json 中特定键的值，所以我想使用responseObjectas NSDictionary。这就是我正在尝试的：
NSError *jsonError = nil;
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:(NSData *)responseObject options:kNilOptions error:&jsonError];
it didn't work:
它没有用：
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFDictionary bytes]: unrecognized selector sent to instance 0xa048120'
how can I get the value of a specific key in responseObject?
如何获取特定键的值responseObject？
回答by Marcelo Fabri
By default, AFHTTPRequestOperationManagersets responseSerializerto an AFJSONResponseSerializerinstance, so responseObjectalready is your parsed JSON (in your case, it'll be an NSDictionaryaccording to what you said).
默认情况下，AFHTTPRequestOperationManager设置responseSerializer为一个AFJSONResponseSerializer实例，因此responseObject已经是您解析的 JSON（在您的情况下，它将NSDictionary根据您所说的进行）。
Then, just use it as you'd use a dictionary:
然后，就像使用字典一样使用它：
NSString *value = responseObject[@"someKey"];
回答by vikingosegundo
The response object is already a dictionary! AFNetworking did handle that for you.
响应对象已经是一个字典！AFNetworking 确实为您处理了这个问题。
