xcode counting JSON items - iphone

Question

I need to Count the number of Items (post) in this JSON response,
2012-06-04 14:09:57.872 horitable[72261:11903] JSON : {
posts = (
{
post = {
eventdate = "2012-03-31";
eventid = 2;
eventimage = "http://hernandoz.local/~hernandoz/kopict/02_31march2012.jpg";
eventinfo = "02 event";
eventname = "xplosion 02";
};
},
{
post = {
eventdate = "2012-07-07";
eventid = 3;
eventimage = "http://hernandoz.local/~hernandoz/kopict/greg_vs_turner.jpg";
eventinfo = "02 event";
eventname = "Xplosion 02";
};
},
{
post = {
eventdate = "2012-04-29";
eventid = 4;
eventimage = "http://hernandoz.local/~hernandoz/kopict/ko_itclub_apr_2012.jpg";
eventinfo = "KO East London Interclub";
eventname = "KO Interclub";
};
}
);
}
I know there are only 3 events (post), this is the code I am using
[[AFNetworkActivityIndicatorManager sharedManager] decrementActivityCount];
NSLog(#"JSON : %#", JSON); //get the JSON response
// 6.1 - Load JSON into internal variable
jsonResponse = JSON;
// 6.2 - Get the number of shows (post)
int shows = 0;
for (NSDictionary* day in jsonResponse) {
shows += [[day objectForKey:#"posts"] count];
NSLog(#"count : %d",shows);
}
I get an error , but I don't understand why .
-[__NSCFString objectForKey:]: unrecognized selector sent to instance 0x76986f0
can someone please help me out . Thanks

Answer 1

try this
NSLog(#"Response members= %#",responseString);
NSArray *array = [(NSDictionary*)[responseString JSONValue] objectForKey:#"posts"];
NSLog(#"Count value= %d",[array count]);

Answer 2

in your case you can do this
[[AFNetworkActivityIndicatorManager sharedManager] decrementActivityCount];
NSLog(#"JSON : %#", JSON); //get the JSON response
// 6.1 - Load JSON into internal variable
jsonResponse = JSON;
// 6.2 - Get the number of shows (post)
int shows = [[jsonResponse objectForKey:#"posts"] count];
NSLog(#"count : %d",shows);

Answer 3

you need to first fragmentize json as
NSDictionary * dict = [JSON JSONValue];
or
NSDictionary * dict = [JSON JSONFragmentValue];
then
for (NSDictionary* day in dict) {
shows += [[day objectForKey:#"posts"] count];
NSLog(#"count : %d",shows);
}

Answer 4

The problem was JSON as an ID, this works
jsonResponse = [(NSDictionary*)JSON objectForKey:#"posts"];

Answer 5

I think you are mistakely put "posts" instead of "post". The key "posts" contain an array of dictionary, and each dictionary has a key "post". What you are doing is you take all dictionaries from array in lines
for (NSDictionary* day in jsonResponse) {
and check for an key "posts" in dictionary. Really, there is no key called "posts" in dictionary. I is "post". And the value for "post" is a NSDictionary not an array. So you cant call count there. The solution for your issue is remove un-necessary APIs inside for loop
[[AFNetworkActivityIndicatorManager sharedManager] decrementActivityCount];
jsonResponse = JSON;
int shows = 0;
for (NSDictionary* day in jsonResponse) {
shows += 1;
}
NSLog(#"count : %d",shows);