parse json results using NSJSONSerialization

Question

I am trying to parse this json:

{
    "myData": [
        {
            "date": "2013-07-29",
            "preferredMeetingLocation": "home",
            "isbn": null,
            "category": "Clothing",
            "price": "5",
            "title": "clothingstuff",
            "description": "Desc"
        },
        {
            "date": "2013-07-29",
            "preferredMeetingLocation": "home2",
            "isbn": null,
            "category": "Clothing",
            "price": "2",
            "title": "other",
            "description": "Desc2"
        }
    ]
}

So far I have:

    NSDictionary *json = [NSJSONSerialization JSONObjectWithData:jsonData options:kNilOptions error:nil];
    NSDictionary *results = [json objectForKey:@"myData"];
for (NSDictionary *item in results) {
    NSLog(@"results::%@", [results objectForKey:@"title"]);
}

but I get Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFArray objectForKey:]: unrecognized selector sent to instance 0x8877e40'

The main goal is to be able to parse the data received and then display each set of info in a cell.

What am I doing wrong?

You're doing precisely what the message says you're doing: Trying to perform "objectForKey" on an NSArray. — Hot Licks
– Hot Licks, Commented Jul 29, 2013 at 18:30

Martin R · Accepted Answer · 2013-07-29 18:17:36Z

2

The line

 NSLog(@"results::%@", [results objectForKey:@"title"]);
 //                        ^---- Wrong variable used here!

should be

 NSLog(@"results::%@", [item objectForKey:@"title"]);

answered Jul 29, 2013 at 18:17

Martin R

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2 Comments

BluGeni Over a year ago

ah shoot thanks, also if I want to get the count for how much items came back, in this case 2, how do I get that? I think its something like [[results allKeys] count]; but that crashes as well

Martin R Over a year ago

@BluGeni: Note that results should be an array: NSArray *results = ... as @rmaddy correctly said in his answer. And then [results count] should work.

rmaddy · Accepted Answer · 2013-07-29 18:19:49Z

1

results should be an array. And you are logging the wrong object.

NSDictionary *json = [NSJSONSerialization JSONObjectWithData:jsonData options:kNilOptions error:nil];
NSArray *results = [json objectForKey:@"myData"];
for (NSDictionary *item in results) {
    NSLog(@"title::%@", [item objectForKey:@"title"]);
}

answered Jul 29, 2013 at 18:19

rmaddy

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