Getting Nil trying to decode json - swift

Question

I'm trying to decode the Json from this URL(:
https://api.letsbuildthatapp.com/appstore/featured
from "Lets build that app tutorials"
This is the code I wrote:
import UIKit
class AppCategory: NSObject{
var name: String?
var apps: [App]?
static func fetchedFeaturedApps(){
let jsonUrlString = "https://api.letsbuildthatapp.com/appstore/featured"
guard let url = URL(string: jsonUrlString) else {return}
URLSession.shared.dataTask(with: url) { (data, response, err) in
guard let data = data else {return}
do{
let featured = try JSONDecoder().decode(Featured.self, from: data)
}catch{
print(err)
}
}.resume()
}
}
struct Featured: Decodable {
var bannerCategory: Banner?
var featuredCategories: [mCategory]?
}
struct Banner: Decodable {
var name: String?
var apps: [String]?
var type: String?
}
struct mCategory: Decodable {
var name: String?
var apps: [App]?
var type: String?
}
struct App: Decodable {
var id: Int?
var name: String?
var category: String?
var price: Float?
var imageName: String?
}
I tried to follow the tutorial but It didn't work for me.
I always get nil while trying to decode the json from the url. I'm really new to this and can't figure out what I'm doing wrong. I know to decode the json properly I need to have Structs as same as the json (like an app array in category) but it still won't work.
EDIT: Should've mentioned, When I run it, the code goes into the catch block and printing "nil".
I tried printing the 'err' but this is all I get in the log:
2019-02-09 19:07:45.241000+0200 AppStore[2344:120273] [AXMediaCommon] Unable to look up screen scale
2019-02-09 19:07:45.241153+0200 AppStore[2344:120273] [AXMediaCommon] Unexpected physical screen orientation
2019-02-09 19:07:45.314112+0200 AppStore[2344:120273] [AXMediaCommon] Unable to look up screen scale
2019-02-09 19:07:45.319977+0200 AppStore[2344:120273] [AXMediaCommon] Unable to look up screen scale
2019-02-09 19:07:45.320189+0200 AppStore[2344:120273] [AXMediaCommon] Unexpected physical screen orientation
nil

Answer 1

You have
typeMismatch(Swift.String, Swift.DecodingError.Context(codingPath: [CodingKeys(stringValue: "bannerCategory", intValue: nil)], debugDescription: "Expected to decode String but found a dictionary instead.", underlyingError: nil))
you need
struct Featured: Codable {
let bannerCategory: BannerCategory
let categories: [Category]
}
struct BannerCategory: Codable {
let name: String
let apps: [BannerCategoryApp]
let type: String
}
struct BannerCategoryApp: Codable {
let imageName: String
enum CodingKeys: String, CodingKey {
case imageName = "ImageName"
}
}
struct Category: Codable {
let name: String
let apps: [CategoryApp]
let type: String
}
struct CategoryApp: Codable {
let id: Int?
let name, category: String?
let price: Double?
let imageName: String
enum CodingKeys: String, CodingKey {
case id = "Id"
case name = "Name"
case category = "Category"
case price = "Price"
case imageName = "ImageName"
}
}
class AppCategory: NSObject{
var name: String?
var apps: [CategoryApp]?
static func fetchedFeaturedApps(){
let jsonUrlString = "https://api.letsbuildthatapp.com/appstore/featured"
guard let url = URL(string: jsonUrlString) else {return}
URLSession.shared.dataTask(with: url) { (data, response, err) in
guard let data = data else {return}
do{
let featured = try JSONDecoder().decode(Featured.self, from: data)
print(featured)
}catch{
print(error)
}
}.resume()
}
}