Converting NSString to NSDictionary / JSON - objective-c

Question

I have the following data saved as an NSString :
{
Key = ID;
Value = {
Content = 268;
Type = Text;
};
},
{
Key = ContractTemplateId;
Value = {
Content = 65;
Type = Text;
};
},
I want to convert this data to an NSDictionary containing the key value pairs.
I am trying first to convert the NSString to a JSON objects as follows :
NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
id json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
However when I try :
NSString * test = [json objectForKey:#"ID"];
NSLog(#"TEST IS %#", test);
I receive the value as NULL.
Can anyone suggest what is the problem ?

Answer 1

I believe you are misinterpreting the JSON format for key values. You should store your string as
NSString *jsonString = #"{\"ID\":{\"Content\":268,\"type\":\"text\"},\"ContractTemplateID\":{\"Content\":65,\"type\":\"text\"}}";
NSData *data = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
id json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
Now if you do following NSLog statement
NSLog(#"%#",[json objectForKey:#"ID"]);
Result would be another NSDictionary.
{
Content = 268;
type = text;
}

Answer 2

I think you get the array from response so you have to assign response to array.
NSError *err = nil;
NSArray *array = [NSJSONSerialization JSONObjectWithData:[string dataUsingEncoding:NSUTF8StringEncoding] options:NSJSONReadingMutableContainers error:&err];
NSDictionary *dictionary = [array objectAtIndex:0];NSString *test = [dictionary objectForKey:#"ID"];NSLog(#"Test is %#",test);

Answer 3

Use this code where str is your JSON string:
NSError *err = nil;
NSArray *arr =
[NSJSONSerialization JSONObjectWithData:[str dataUsingEncoding:NSUTF8StringEncoding]
options:NSJSONReadingMutableContainers
error:&err];
// access the dictionaries
NSMutableDictionary *dict = arr[0];
for (NSMutableDictionary *dictionary in arr) {
// do something using dictionary
}

Answer 4

Swift 3:
if let jsonString = styleDictionary as? String {
let objectData = jsonString.data(using: String.Encoding.utf8)
do {
let json = try JSONSerialization.jsonObject(with: objectData!, options: JSONSerialization.ReadingOptions.mutableContainers)
print(String(describing: json))
} catch {
// Handle error
print(error)
}
}

Answer 5

Use the following code to get the response object from the AFHTTPSessionManager failure block; then you can convert the generic type into the required data type:
id responseObject = [NSJSONSerialization JSONObjectWithData:(NSData *)error.userInfo[AFNetworkingOperationFailingURLResponseDataErrorKey] options:0 error:nil];