如何在 Xcode / iOS 中调用 Watson Personality Traits API

Question

>我正在尝试执行一个 POST 请求以https://gateway.watsonplatform.net/personality-insights/api/v2/profile application/json作为Content-Type，下一个 json 作为正文：

 {
   "contentItems" : [
     {
       "sourceid" : "twitter",
       "id" : "MYID",
       "userid" : "json",
       "language" : "en",
       "content" : "Call me Ishmael Some years ago-never mind how long precisely-having little or no money in my purse and nothing particular to interest me on shore I thought I would sail about a little and see the watery part of the world It is a way I have of driving off the spleen and regulating the circulation Whenever I find myself growing grim about the mouth whenever it is a damp drizzly November in my soul whenever I find myself involuntarily pausing before coffin warehouses and bringing up the rear of every funeral I meet and especially whenever my hypos get such an upper hand of me that it requires a strong moral principle to prevent me from deliberately stepping into the street and methodically knocking peoples hats off-then I account it high time to get to sea as soon as I can",
       "contenttype" : "text/plain"
     }
   ]
 }

我试图用AFNetworking来做到这一点，这是我得到的：

NSString *authStr = [NSString stringWithFormat:@"%@:%@", @"PI-USERNAME", @"PI-PASSWORD"];
 NSData *authData = [authStr dataUsingEncoding:NSUTF8StringEncoding];
 NSString *authValue = [NSString stringWithFormat:@"Basic %@", [authData base64Encoding]];
 AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
 [manager.requestSerializer setValue:authValue forHTTPHeaderField:@"Authorization"];
 NSString *sContent = @"Call me Ishmael Some years ago-never mind how long precisely-having little or no money in my purse and nothing particular to interest me on shore I thought I would sail about a little and see the watery part of the world It is a way I have of driving off the spleen and regulating the circulation Whenever I find myself growing grim about the mouth whenever it is a damp drizzly November in my soul whenever I find myself involuntarily pausing before coffin warehouses and bringing up the rear of every funeral I meet and especially whenever my hypos get such an upper hand of me that it requires a strong moral principle to prevent me from deliberately stepping into the street and methodically knocking peoples hats off-then I account it high time to get to sea as soon as I can";
 NSDictionary *myDictionary = [[NSDictionary alloc]initWithObjectsAndKeys:
                                    @"MYID", @"id",
                                    @"jason", @"userid",
                                    @"twitter", @"sourceid",
                                    @"text/plain", @"contenttype",
                                    @"en", @"language",
                                    sContent, @"content",
                                    nil];
 NSArray *myArray = [[NSArray alloc]initWithObjects:myDictionary, nil];
 NSDictionary *parameters = [[NSDictionary alloc]initWithObjectsAndKeys:myArray,@"contentItems", nil];
 [manager POST:@"https://gateway.watsonplatform.net/personality-insights/api/v2/profile" parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) {
     NSLog(@"JSON: %@", responseObject);
 } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
     NSLog(@"Error: %@", error);
 }];

我认为它没有使用正确的序列化程序将我的 NSDictionary 编码为 json 字符串

Answer 1

在发出请求之前，您需要为请求的内容类型设置正确的 AFHTTPRequestSerializer。 您可以按如下方式执行此操作：

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
manager.requestSerializer = [AFJSONRequestSerializer serializer];
[manager.requestSerializer setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];