How to get dictionary objects in array - ios

Question

I have a dict(NSDictionary) that has the following data.
{
images = (
{
image = "image.jpg";
scores = (
{
"classifier_id" = "Adventure_Sport";
name = "Adventure_Sport";
score = "0.662678";
},
{
"classifier_id" = Climbing;
name = Climbing;
score = "0.639987";
},
{
"classifier_id" = Flower;
name = Flower;
score = "0.628092";
},
{
"classifier_id" = "Nature_Scene";
name = "Nature_Scene";
score = "0.627548";
},
{
"classifier_id" = Icicles;
name = Icicles;
score = "0.617094";
},
{
"classifier_id" = Volcano;
name = Volcano;
score = "0.604928";
},
{
"classifier_id" = Potatoes;
name = Potatoes;
score = "0.602799";
},
{
"classifier_id" = "Engine_Room";
name = "Engine_Room";
score = "0.595812";
},
{
"classifier_id" = Bobsledding;
name = Bobsledding;
score = "0.592521";
},
{
"classifier_id" = White;
name = White;
score = "0.587923";
},
{
"classifier_id" = Yellow;
name = Yellow;
score = "0.574398";
},
{
"classifier_id" = "Natural_Activity";
name = "Natural_Activity";
score = "0.54574";
},
{
"classifier_id" = Butterfly;
name = Butterfly;
score = "0.526803";
},
{
"classifier_id" = "Dish_Washer";
name = "Dish_Washer";
score = "0.513662";
},
{
"classifier_id" = Rainbow;
name = Rainbow;
score = "0.511032";
}
);
}
);
}
I am not able to figure out a way to access classfier_id in an array
Really need your help. Thanks. PS I have already tried dict["scores"] and dict["image.scores"]
Kindly help.. Thanks

Answer 1

You want
let classifier_ids = dict["scores"].map{$0["classifier_id"]}
If your containers are NSObjects rather than Swift Dictionaries and Arrays then you will need to add some type-casting, but that's the basic idea.
This code would be safer for non-typed collections:
var classifier_ids: [String?]
if let array = dict["scores"] as? [String:String]
{
let classifier_ids = array.map{$0["classifier_id"]}
}
That should give you an array of optionals, where a given entry will be nil if that entry in the array did not contain a "classifier_id" key/value pair.
Or if you want to skip entries that don't contain a "classifier_id" key/value pair:
var classifier_ids: [String]
if let array = dict["scores"] as? [String:String]
{
let classifier_ids = array.flatmap{$0["classifier_id"]}
}

Answer 2

Taking it a step at at time:
if let array = dict["images"] as? NSArray {
if let array2 = array[0]["scores"] as? NSArray {
if let ids = array2.valueForKey("classifier_id") as? [String] {
// use array of ids
print(ids)
}
}
}
or all in one shot:
if let ids = (dict["images"]?[0]["scores"])?.valueForKey("classifier_id") as? [String] {
// use array of ids
print(ids)
}