get value from NSDictionary not work - ios

Question

1.I get JSON data from web services and add It's to NSDictionary
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:&error];
2.Then I Show "dic" in NSLog It's present
{"query": [{"IndexNo": 1,"ID": "01","Picture": "img/food-48.png"}]}
3.Then I get data value from "dic" in to new NSDictionary "dt"
NSDictionary *dt = [dic objectForKey: #"query"];
4.Then I Show "dt" in NSLog It's present
({ID = 01;IndexNo = 1;Picture = "img/food-48.png";})
5.I want to get "ID" from "dt". I use this code
NSString *ID = [dt objectForKey: #"ID"];
but it's error
-[__NSCFArray objectForKey:]: unrecognized selector sent to instance 0x8a40a60

Answer 1

Can you try this
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:&error];
NSArray *arr = [dic objectForKey: #"query"];
NSDictionary *dt = arr[0];
NSString *ID = [dt objectForKey: #"ID"];

Answer 2

[dic objectForKey: #"query"] returns an NSArray actually. Note these square brackets in the output from the first NSLog statement:
{"query": [...]}
Try this:
NSArray *dtArray = [dic objectForKey: #"query"];
NSDictionary *dt = dtArray[0];
NSString *ID = [dt objectForKey:#"ID"];
Or to use the key-value coding behavior of NSDictionary and NSArray:
NSString *ID = [[dic valueForKeyPath:#"query.ID"] firstObject];

Answer 3

NSDictionary *dt = [[dic objectForKey: #"query"] objectAtIndex:0];
NSString *ID = [dt objectForKey: #"ID"];
You are trying to get value for key from array. change these lines.

Answer 4

From your jsonStructure
{"query": [{"IndexNo": 1,"ID": "01","Picture": "img/food-48.png"}]}
object for key "query" is an array as {} is a dictionary and [] is an array. so do the following
NSArray *tempArray = [dt objectForKey:#"query"];
NSDictionary *tempDictionary = [tempArray objectAtIndex:0];
NSString *ID = [tempDictionary objectForKey:#"ID"];
Hope this helps.