How to Call URL in API Nested Array - arrays

Question

I'm new to REST API and am having some trouble. I'm trying to call data from an array that's nested within a dictionary. While I've been able to pull data from other variables fine, this is giving me some problems. For reference, the URL I need is labeled "front default," inside the "sprites" array. Furthermore, the URL is that of an image, and I am using Alamofire Image to display images. I will include the code I've used thus far to call other variables, along with a screenshot of the API's structure.
Screenshot of API hierarchy
import Foundation
import Alamofire
import AlamofireImage
import SwiftyJSON
import Siesta
class PokeInfo {
var name: String
var id: Int
var abilities: [String]
var types: [String]
// converts dictionary into string
init?(jsonDictionary: [String: Any]) {
//guard used to check if value entered in search bar matches a name in API data
guard let name = jsonDictionary["name"] as? String,
let id = jsonDictionary["id"] as? Int,
//abilities data nested. First must be set to string
let abilities = jsonDictionary["abilities"] as? [[String: Any]],
let types = jsonDictionary["types"] as? [[String: Any]]
else {
return nil
};
var abilityNames: [String] = []
var typeNames: [String] = []
//targets nested data, going inside dictionary to find attributes of that element
for abilityDictionary in abilities {
guard let ability = abilityDictionary["ability"] as? [String: Any], let name = ability["name"] as? String else { break }
abilityNames.append(name)
};
for typeDictionary in types {
guard let type = typeDictionary["type"] as? [String: Any], let name = type["name"] as? String else { break }
typeNames.append(name)
}
self.name = name
self.id = id
self.abilities = abilityNames
self.types = typeNames
}
}

Answer 1

As of Swift 4 you should be using Codable for JSON which is now part of the language. Here is a Playground example:
import PlaygroundSupport
import UIKit
class PokeInfo: Codable {
var name: String
var id: Int
var abilities: [String]
var types: [String]
}
let pokeString = """
{
"name": "test",
"id": 1,
"abilities": ["a", "b", "c"],
"types": ["x", "y", "z"]
}
"""
let pokeData = pokeString.data(using: .utf8)!
let decoder = JSONDecoder()
let pokeInfo = try! decoder.decode(PokeInfo.self, from: pokeData)
print(pokeInfo.abilities)
the output is:
["a", "b", "c"]