Allocate Json Array into NSArray (JSONKit)

Question

How can allocate that jSon response into a NSArray?

jSON:

[{"city":"Entry 1"},{"city":"Entry 2"},{"city":"Entry 3"}]

Code:

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    NSArray *jsonData = [responseData objectFromJSONData];

    for (NSDictionary *dict in jsonData) {
        cellsCity = [[NSArray alloc] initWithObjects:[dict objectForKey:@"city"], nil];
    }

}

the line NSArray *jsonData = [responseData objectFromJSONData]; already gets you your JSON into an array. What did you mean by using the verb "allocate" ? — Marin Todorov
– Marin Todorov, Commented Feb 15, 2013 at 7:41
@IcanZilb This way it will pick up all city entries or just the first one? — Luciano Nascimento
– Luciano Nascimento, Commented Feb 15, 2013 at 7:43
Just add "NSLog(@"obj:%@", jsonData)" after that line and you will see. — Marin Todorov
– Marin Todorov, Commented Feb 15, 2013 at 7:45

Alexander · Accepted Answer · 2013-02-15 08:51:39Z

2

You could get JSON into Objects via Apples built in serializer:

NSError *error = nil;
NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData:aData options:NSJSONWritingPrettyPrinted error:&error];
if(error){
    NSLog(@"Error parsing json");
    return;
} else {...}

So there is no need to use external frameworks IMHO (unlees you need performance and JSONKit is, like they say, really 25-40% faster than NSJSONSerialization.

EDIT

Through your comments I guess this is what you want

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    //First get the array of dictionaries
    NSArray *jsonData = [responseData objectFromJSONData];
    NSMutableArray *cellsCity = [NSMutableArray array];
    //then iterate through each dictionary to extract key-value pairs 
    for (NSDictionary *dict in jsonData) {
        [cellsCity addObject:[dict objectForKey:@"city"]];
    }

}

edited Feb 15, 2013 at 8:51

answered Feb 15, 2013 at 7:46

Alexander

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5 Comments

Luciano Nascimento Over a year ago

Using JSONKit how I can do that?

Alexander Over a year ago

You are sending a json object in an array, so your line NSArray *jsonData = [responseData objectFromJSONData]; is just fine. That's all you need.

Luciano Nascimento Over a year ago

With my code the cellsCity return only Entry 3, and using NSArray *jsonData = [responseData objectFromJSONData]; I get error.

Luciano Nascimento Over a year ago

I would like cellsCity return an array with Entry 1, Entry 2, Entry 3.

Alexander Over a year ago

Sure you are getting just entry 3. You are overwriting cellsCity in the loop so that only the last entry (3) will "survive"!!! See my edits

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