Question

Everything messed up in my head. enum, NSObject, custom interface and so on…
All I need is to declare data type in Objective C for representing this JSON collection:

{
 "firstName": "John",
 "lastName" : "Smith",
 "age"      : 25,
 "address"  :
 {
     "streetAddress": "21 2nd Street",
     "city"         : "New York",
     "state"        : "NY",
     "postalCode"   : "10021"
 },
 "phoneNumber":
 [
     {
       "type"  : "home",
       "number": "212 555-1234"
     },
     {
       "type"  : "fax",
       "number": "646 555-4567"
     }
 ]

}

This is example from wikipedia JSON article. So I need an explanation about how can I put all this data in collection (or custom type or something else, I don’t know).

For example I need 1000 instances of “phonebook” collection to store and change information about 1000 people. I need to know how can I do it.

Answer 1

example for firstname and address:

NSError* error;
NSDictionary* json = [NSJSONSerialization 
                  JSONObjectWithData:data 
                      options:kNilOptions 
                      error:&error];

NSString *firstname = [json objectForKey:@"firstname"]; 
NSDictionary *address = [json objectForKey:@"address"]; 

more here: http://caydenliew.com/2011/11/json-in-ios-5/