ios - AFNetworking 2.0-使用responseObject作为NSDictionary

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);
}];

这是在AFNetworking 2.0中发送GET请求的recommended way。我想获取json中特定键的值，所以我想使用responseObject作为NSDictionary。这是我正在尝试的:

NSError *jsonError = nil;
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:(NSData *)responseObject options:kNilOptions error:&jsonError];

它不起作用:

 *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFDictionary bytes]: unrecognized selector sent to instance 0xa048120'

如何获得responseObject中特定键的值？

最佳答案

默认情况下，AFHTTPRequestOperationManager将responseSerializer设置为AFJSONResponseSerializer实例，因此responseObject已经是您解析的JSON(在您的情况下，根据您的说法将是NSDictionary)。

然后，就像使用字典一样使用它:

NSString *value = responseObject[@"someKey"];