complex JSON parsing using Objective-C - objective-c

Question

{
"Flight1":{
"3":{
"id":"10",
"name":"JumboJet1B",
"level":"1",
"category":"1",
"energy":"10",
"bonus":"10",
"completed":0
},
"4":{
"id":"10",
"name":"JumboJet1B",
"level":"1",
"category":"1",
"energy":"10",
"bonus":"10",
"completed":0
}
}
}
This was the json output
How can I parse inside the items of 3 and 4, say getting the id, energy and name
Thanks!

Answer 1

If the order inside Flight1 doesn’t matter, the following should work:
NSDictionary *flights = … // result from a JSON parser
NSDictionary *flight1 = [flights objectForKey:#"Flight1"];
for (NSString *key in [flight1 allKeys]) {
NSDictionary *flight1Entry = [flight1 objectForKey:key];
NSString *entryId = [flight1Entry objectForKey:#"id"];
NSString *entryName = [flight1Entry objectForKey:#"name"];
NSString *entryEnergy = [flight1Entry objectForKey:#"energy"];
…
}
Otherwise, if you want the keys sorted according to their numeric value:
NSDictionary *flights = … // result from a JSON parser
NSDictionary *flight1 = [flights objectForKey:#"Flight1"];
NSArray *flight1Keys = [[flight1 allKeys] sortedArrayUsingComparator:^(id o1, id o2) {
NSInteger i1 = [o1 integerValue];
NSInteger i2 = [o2 integerValue];
NSComparisonResult result;
if (i1 > i2) result = NSOrderedDescending;
else if (i1 < i2) result = NSOrderedAscending;
else result = NSOrderedSame;
return result;
}];
for (NSString *key in flight1Keys) {
NSDictionary *flight1Entry = [flight1 objectForKey:key];
NSString *entryId = [flight1Entry objectForKey:#"id"];
NSString *entryName = [flight1Entry objectForKey:#"name"];
NSString *entryEnergy = [flight1Entry objectForKey:#"energy"];
…
}

Answer 2

Assuming that you are using the json framework you could access it like this:
NSDictionary *jsonDict = [jsonString JSONValue];
NSString *id = [[[jsonDict objectForKey:#"Flight1"] objectForKey:#"3"] objectForKey:#"id"];
This assumes alot, so make use of try except blocks or iterate through the different levels.