How to parse JSON multi-array

Question

I need to parse the JSON file provided by Google Maps API Then i use the AFNetworkingRequestHow to get the JSON response. I built this dictionary:

    NSDictionary *jsonDict = (NSDictionary *) JSON;
    NSArray *rows = [jsonDict objectForKey:@"rows"];

But now, how can i reach the first value field of duration tag?

JSON File to parse:

{
"destination_addresses" : [ "San Francisco, CA, USA", "Victoria, BC, Canada" ],
"origin_addresses" : [ "Vancouver, BC, Canada", "Seattle, WA, USA" ],
"rows" : [
   {
      "elements" : [
         {
            "distance" : {
               "text" : "1,527 km",
               "value" : 1527251
            },
            "duration" : {
               "text" : "15 hours 0 mins",
               "value" : 54010
            },
            "status" : "OK"
         },
         {
            "distance" : {
               "text" : "112 km",
               "value" : 111906
            },
            "duration" : {
               "text" : "3 hours 1 min",
               "value" : 10885
            },
            "status" : "OK"
         }
      ]
   }   
}

Check [here the technique](http://stackoverflow.com/questions/14958883/ios-serialize-deserialize-complex-json-generically-from-nsobject-class/16771574#16771574) that is more generic and less error prone. — Alphapico, Jun 03 '13 at 06:54

Anupdas · Accepted Answer · 2013-06-03T06:31:03.950

1

Try

NSDictionary *jsonDict = (NSDictionary *) JSON;;

NSArray *rows = jsonDict[@"rows"];
NSDictionary *row = rows[0];

NSArray *elements = row[@"elements"];
NSDictionary *element = elements[0];

NSDictionary *duration = element[@"duration"];
NSInteger value = [duration[@"value"] integerValue];

edited Jun 03 '13 at 06:31

answered Jun 03 '13 at 06:21

Anupdas

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score 0 · Answer 2 · answered Jun 03 '13 at 06:18

0

[json objectForKey:@"elements"]

is an NSArray. You can't initialize an NSDictionary directly with an array.

(in JSON, { and } denote key-value pairs, like NSDictionary, whereas [ and ] delimit ordered lists like NSArray, that's why the mapping is done as it is...)

Following thinks can you understanding for development time so it may help lot.

answered Jun 03 '13 at 06:18

Nimit Parekh

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Sorry, but the NSDictionary isn't initialized with an array. – Victor Casé Jun 03 '13 at 06:23
for that you need to fetch first object from the array and then apply objectForKey. – Nimit Parekh Jun 03 '13 at 06:30

score 0 · Answer 3 · answered Jun 03 '13 at 06:25

0

You can use the following code:

NSString *valueString = [[[[[rows objectAtindex:0]objectForKey:@"elements" ]objectAtindex:0]objectForKey:@"duration"] objectForKey:@"value"];

//if you want integer value
NSInteger value = [valueString integerValue];

answered Jun 03 '13 at 06:25

manujmv

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How to parse JSON multi-array

3 Answers3