IOS JSON get all values from a "JSON Dict" - iphone

Question

i have this data structure :
{
"artistlist " : [
{
"performer" : "Gate Zero"
},
{
"performer" : "nightech"
},
{
"performer" : "Marko Fuerstenberg"
},
]
}
I read this structure from NSString into NSDictionary with this line of code:
JSON = [NSJSONSerialization JSONObjectWithData:
[[chunks objectAtIndex:1]
dataUsingEncoding:NSUTF8StringEncoding] options:
NSJSONReadingMutableContainers error: &e];
with: [JSON objectForKey:#"artistlist "] i get this structure:
(
{
performer = "Gate Zero";
},
{
performer = nightech;
},
{
performer = "Marko Fuerstenberg";
}
)
Is there any way to go "deeper" ?
how would i parse the resulting Structure ?
I would like to get a list of values or access performer names directly. What if i have several values in a tupel for example performer name, album, year. How would i access those values?
Thank you.

Answer 1

Yes, after you have [JSON objectForKey:#"artistlist "], you get an NSArray of NSDictionaries (slightly confusing!).
NSArray *performersArray = [JSON objectForKey:#"artistlist"];
for (NSDictionary *performerDic in performersArray) {
NSLog(#"%#", [performerDic objectForKey:#"performer"]);
}
This should yield each performer name. Alternatively, you can do for (NSUInteger i = 0; i < [performersArray count]; i++) and access NSDictionary *performersDic = [performersArray objectAtIndex: i]. From there, you can similarly use [performsDic objectForKey:#"performer"]

Answer 2

Like this:
[[[JSON objectForKey:#"artistlist "] objectAtIndex: 1] objectForKey:#"performer"]
It will give you "nightech".
{} corresponds to NSDictionary, [] corresponds to NSArray.

Answer 3

You'll have to use recursion. For example, assuming you have only nested NSDictionaries (easy to modify to work with NSArrays):
- (void) getArtistFromJsonObject:(NSDictionary *)obj {
for (NSString *key in [obj allKeys]) {
id child = [obj objectForKey:key];
if ([child isKindOfClass:[NSString class]]) {
// that's the actual string
// NSLog(#"Found artist: %#", child); // or do whatever needed
} else if ([child isKindOfClass:[NSDictionary class]]) {
[self getArtistFromJsonObject:child];
}
}
}