Create array of json objects in objective c

Question

I am new to objective-c and need to submit collection of json objects.

I wrote the following:

NSDictionary *jsonDictionary = [NSDictionary dictionaryWithObjectsAndKeys:
                                id, @"id",
                                toClientGroupType, @"toClientGroupType",
                                dueDate, @"dueDate",
                                actionDate, @"actionDate",
                                campaignType, @"campaignType",
                                campaignCategory, @"campaignCategory",
                                businessId, @"businessId",
                                promotion, @"promotion",
                                product, @"product",
                                contentF, @"content",
                                subject, @"subject",
                                nil];
NSData *jsonData2 = [NSJSONSerialization dataWithJSONObject:jsonDictionary options:NSJSONWritingPrettyPrinted error:&error];
NSString *jsonString = [[NSString alloc] initWithData:jsonData2 encoding:NSUTF8StringEncoding];
NSLog(@"jsonData as string:\n%@", jsonString);
[request setURL:[NSURL URLWithString:@"https://services-dev.a.com/api/channels"]];
[request setHTTPMethod:@"POST"];
[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[request setHTTPBody:jsonData2];

I have 2 problems:

A. The output of jsonData as String is

{
      "toClientGroupType" : "VIP",
      "id" : "1",
      "dueDate" : "2012-09-03 10:25:42 +0000",
      "actionDate" : "2012-09-03 10:25:42 +0000",
      "campaignType" : "ONE_TIME",
      "businessId" : "150",
      "campaignCategory" : "SALE"
    }

As you see - I am missing 3 fiels which I declared: content, product and subject

B. I actually need to submit an array of objects so the request will be like this:

[{
  "toClientGroupType" : "VIP",
  "id" : "1",
  "dueDate" : "2012-09-03 10:25:42 +0000",
  "actionDate" : "2012-09-03 10:25:42 +0000",
  "campaignType" : "ONE_TIME",
  "businessId" : "150",
  "campaignCategory" : "SALE"
}]

How can I do it and what is wrong?

Prashant Patil · Accepted Answer · 2012-09-03 11:14:44Z

12

NSDictionary *jsonDictionary = [NSDictionary dictionaryWithObjectsAndKeys:
                            id, @"id",
                            toClientGroupType, @"toClientGroupType",
                            dueDate, @"dueDate",
                            actionDate, @"actionDate",
                            campaignType, @"campaignType",
                            campaignCategory, @"campaignCategory",
                            businessId, @"businessId",
                            promotion, @"promotion",
                            product, @"product",
                            contentF, @"content",
                            subject, @"subject",
                            nil];


NSMutableArray * arr = [[NSMutableArray alloc] init];

[arr addObject:jsonDictionary];
NSData *jsonData2 = [NSJSONSerialization dataWithJSONObject:arr options:NSJSONWritingPrettyPrinted error:&error];
NSString *jsonString = [[NSString alloc] initWithData:jsonData2 encoding:NSUTF8StringEncoding];
NSLog(@"jsonData as string:\n%@", jsonString);

Checkout this one

edited Sep 3, 2012 at 11:14

answered Sep 3, 2012 at 10:52

Prashant Patil

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5 Comments

Dejell Over a year ago

I get No visible @interface for 'NSMutableArray' declares the selector 'addobject:'

Dejell Over a year ago

Thanks it's working but my first question is still not working. promotion, product, content and subject are not being parsed in the JSON string

Prashant Patil Over a year ago

Can you please print the data in promotion, product, content and subject.

Dejell Over a year ago

Sorry my mistake promotion was initialized as int - and therefore it couldn't add it to the dictionary. Unfortunately I didn't get warning or errors about it

Prashant Patil Over a year ago

most of the times try to use NSNumber

Prashant Patil · Accepted Answer · 2012-09-03 11:26:50Z

 NSError *error;
NSDictionary *jsonDictionary = [NSDictionary dictionaryWithObjectsAndKeys:
                                @"1", @"id",
                                @"test", @"toClientGroupType",
                                @"test", @"dueDate",
                                @"test", @"actionDate",
                                @"test", @"campaignType",
                                @"test", @"campaignCategory",
                                @"test", @"businessId",
                                @"test", @"promotion",
                                @"test", @"product",
                                @"test", @"content",
                                @"test", @"subject",
                                nil];


NSMutableArray * arr = [[NSMutableArray alloc] init];

[arr addObject:jsonDictionary];
NSData *jsonData2 = [NSJSONSerialization dataWithJSONObject:arr options:NSJSONWritingPrettyPrinted error:&error];
NSString *jsonString = [[NSString alloc] initWithData:jsonData2 encoding:NSUTF8StringEncoding];
NSLog(@"jsonData as string:\n%@", jsonString);

Output :- [ { "subject" : "test", "toClientGroupType" : "test", "id" : "1", "dueDate" : "test", "actionDate" : "test", "campaignType" : "test", "businessId" : "test", "product" : "test", "content" : "test", "campaignCategory" : "test", "promotion" : "test" } ]

check out the data in to promotion, product, content and subject.it should not be nil or null

mano · Accepted Answer · 2014-05-30 04:18:32Z

2

-(void)connectionDidFinishLoading:(NSURLConnection *)connection{

NSError *error;

NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:receivedData options:NSJSONReadingAllowFragments error:&error];

 NSArray *categoryArray= [dic valueForKey:@"SELECTED OBJECT KEY"];
    NSLog(@"category%@",categoryArray);
}

category: Display Category array content

answered May 30, 2014 at 4:18

mano

413 bronze badges

1 Comment

mano Over a year ago

Get your Url for example (example.com) NSString *path = @" "; NSURL *urlpath = [NSURL URLWithString:path]; NSURLRequest *request = [NSURLRequest requestWithURL:urlpath cachePolicy:NSURLCacheStorageNotAllowed timeoutInterval:100.0 ]; NSURLConnection * connection = [[NSURLConnection alloc]initWithRequest:request delegate:self ]; [connection start]; and get data from above dictionary.

Community · Accepted Answer · 2017-05-23 12:32:43Z

1

To problem A:

I think your fields are missing because they contain nil values. Keys that contain nil values are not considered when you use NSJSONSerialization

To problem B:

prashant has posted a good solution

edited May 23, 2017 at 12:32

CommunityBot

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answered Sep 3, 2012 at 10:57

E. Lüders

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4 Comments

Dejell Over a year ago

I get No visible @interface for 'NSMutableArray' declares the selector 'addobject:' for the arr line

Dejell Over a year ago

Regarding problem A the fields are not empty. I explicitly set them: for instance: NSString *product = @"EMAIL";

E. Lüders Over a year ago

Hm, this is strange. Have you thought about using an external json library like JSONKit? I use it in many of my projects and never had any problems with it.

E. Lüders Over a year ago

Ok, then I have no other idea than to check your vars again, cause your code seems to be right. Btw. you have not mentioned in you thread that promotion is missing in the output too.

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