iOS / Objective C Parse JSON get int

Question

I've been trying unsuccessfully to parse this json:

[{"op":"replace","path":"/pending_coins","value":20}]

I want the value of 20 so I can do

int quantity = jsonValue; //20 

Here's what I currently have:

    NSArray *patch =[NSJSONSerialization JSONObjectWithData:anEvent.data options:NSJSONReadingMutableContainers error:&e];

    NSDictionary *dict = patch[0];

    NSLog(@"patch: %@", dict);

    NSInteger quantity = (NSInteger)[dict valueForKey:@"value"];
    NSLog(@"quantity: %ld",(long)quantity);

    if (quantity > 0) {
        NSLog(@"You earned %ld coins!",(long)quantity);
    }

I've tried both objectForKey and valueForKey and neither seems to get me what I'm looking for.

If I do [NSString stringWithFormat:@"%@",[patch valueForKey:@"value"]] I get a value of 20 as a String, but intValue and integerValue on that don't seem to net me what I want.

Right now, the logs show this: quantity: -5764607523034234845

Any ideas where I'm going wrong? I can't control the JSON or I'd just nix the outer array around the object.

Answer 1

An integer in a JSON dictionary will be mapped to an instance of NSNumber when deserialized, which has various methods on it to retrieve scalar values.

To get an NSInteger from the JSON you would do:

NSNumber *number = [dict objectForKey:@"value"];
NSInteger quantity = [number integerValue];