Parsing JSON File From iTunes API - ios

Question

The code below attempts parse through a json file that contains details about an artist and their music genre and was collected from the iTunes API. I am trying to extract the collectionName and artistName keys from the file with the use of the guard statement but it isn't working. It prints out parsing error.
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
musicData()
}
let urlString = "https://itunes.apple.com/search?term=Alex&media=music&entity=album"
func musicData(){
let url = URL(string: urlString)
var request = URLRequest(url: url!)
request.httpMethod = "GET"
let task = URLSession.shared.dataTask(with: request) { (data, response, error) in
guard let myData = data else {
return
}
guard let rawJSON = try? JSONSerialization.jsonObject(with: myData, options: []),
let json = rawJSON as? [String:Any] else {
print("error serializing JSON")
return
}
guard let musicDictionary = json["collectionName"] as? [String:String] else {
print("Parsing error")
return
}
}
task.resume()
}
let collectionName = musicDictionary["collectionName"]
let artistName = musicDictionary["artistName"]
}

Answer 1

The property you're trying to access is a level deeper. Better approach is to use JSONDecoder.
Model:
struct Response: Codable {
let resultCount: Int
let results: [Result]
}
struct Result: Codable {
let wrapperType: WrapperType
let collectionType: CollectionType
let artistId, collectionId: Int
let amgArtistId: Int?
let artistName, collectionName, collectionCensoredName: String
let artistViewUrl: String?
let collectionViewUrl, artworkUrl60, artworkUrl100: String
let collectionPrice: Double?
let collectionExplicitness: CollectionExplicitness
let trackCount: Int
let copyright: String
let country: Country
let currency: Currency
let releaseDate, primaryGenreName: String
let contentAdvisoryRating: String?
}
enum CollectionExplicitness: String, Codable {
case explicit = "explicit"
case notExplicit = "notExplicit"
}
enum CollectionType: String, Codable {
case album = "Album"
}
enum Country: String, Codable {
case usa = "USA"
}
enum Currency: String, Codable {
case usd = "USD"
}
enum WrapperType: String, Codable {
case collection = "collection"
}
Decoding:
guard let myData = data else {
return
}
do {
let response = try JSONDecoder().decode(Response.self, from: myData)
print(response.results[0].collectionName)
} catch { print(error) }