Create array of Json Data Items - ios

Question

I have a very long Json array that is full of items that look like this:
[
{
"id": "sm10-1",
"name": "Pheromosa & Buzzwole-GX",
"imageUrl": "https://images.pokemontcg.io/sm10/1.png",
"subtype": "TAG TEAM",
"supertype": "Pokémon",
"hp": "260",
"retreatCost": [
"Colorless",
"Colorless"
],
"convertedRetreatCost": 2,
"number": "1",
"artist": "Mitsuhiro Arita",
"rarity": "Rare Holo GX",
"series": "Sun & Moon",
"set": "Unbroken Bonds",
"setCode": "sm10",
"text": [
"When your TAG TEAM is knocked out, your opponent takes 3 Prize Cards."
],
"types": [
"Grass"
],
"attacks": [
{
"name": "Jet Punch",
"cost": [
"Grass"
],
"convertedEnergyCost": 1,
"damage": "30",
"text": "This attack does 30 damage to 1 of your opponent's Benched Pokémon. (Don't apply Weakness and Resistance for Benched Pokémon.)"
},
{
"name": "Elegant Sole",
"cost": [
"Grass",
"Grass",
"Colorless"
],
"convertedEnergyCost": 3,
"damage": "190",
"text": "During your next turn, this Pokémon's Elegant Sole attack's base damage is 60."
},
{
"name": "Beast Game-GX",
"cost": [
"Grass"
],
"convertedEnergyCost": 1,
"damage": "50",
"text": "If your opponent's Pokémon is Knocked Out by damage from this attack, take 1 more Prize card. If this Pokémon has at least 7 extra Energy attached to it (in addition to this attack's cost), take 3 more Prize cards instead. (You can't use more than 1 GX attack in a game.)"
}
],
"weaknesses": [
{
"type": "Fire",
"value": "×2"
}
],
"imageUrlHiRes": "https://images.pokemontcg.io/sm10/1_hires.png",
"nationalPokedexNumber": 794
}
]
That is just one item of hundreds in the array. What I want to do is grab specific values from each item (i.e. name, imageUrl, supertype, hp, rarity, set) and send them to a struct which will then be added to an array of such structs.
What I currently have prints just prints out all of the json data and I can not figure out how to get individual data and create an array of structs for each individual card.
Here is the code I have currently:
//[TEST] READING JSON FILE LOCALLY
struct card: Decodable {
let name: String
let imageUrl: String
let supertype: String
let artist: String
let rarity: String
let set: String
let types: Array<String>
}
func loadJsonInfo() {
do{
let data = try Data.init(contentsOf: URL.init(fileURLWithPath: Bundle.main.path(forResource: "Unbroken Bonds", ofType: "json")!))
let json = try JSONSerialization.jsonObject(with: data, options: .allowFragments)
print(json)
} catch {
print(error)
}
}
Also, the json file is locally stored in my appData. Thanks in advance for your help!

Answer 1

Give a try to https://quicktype.io/
You put json there. And get all necessary data structures to decode json

Answer 2

To decode a JSON with Decodable type, you need to use JSONDecoder's decode(_:from:) method.
Update your loadJsonInfo() method to,
func loadJsonInfo() {
if let file = Bundle.main.url(forResource: "Unbroken Bonds", withExtension: "json") {
do {
let data = try Data(contentsOf: file)
let arr = try JSONDecoder().decode([Card].self, from: data)
print(arr)
} catch {
print(error)
}
}
}
Note: Use first letter capital while creating a type, i.e. use Card instead of card.

Answer 3

Parsing Code when you have DATA from server. I also removed force unwrapped ! so it won't crash in absence of file
func loadJsonInfo() {
if let path = Bundle.main.path(forResource: "Unbroken Bonds", ofType: "json") {
do {
let data = try Data(contentsOf: URL(fileURLWithPath: path), options: .alwaysMapped)
let result = try JSONDecoder().decode(ResultElement.self, from: data)
} catch let error {
print(error)
}
}
}
Your Model
import Foundation
// MARK: - ResultElement
struct ResultElement: Codable {
let id, name: String?
let imageURL: String?
let subtype, supertype, hp: String?
let retreatCost: [String]?
let convertedRetreatCost: Int?
let number, artist, rarity, series: String?
let resultSet, setCode: String?
let text, types: [String]?
let attacks: [Attack]?
let weaknesses: [Weakness]?
let imageURLHiRes: String?
let nationalPokedexNumber: Int?
enum CodingKeys: String, CodingKey {
case id, name
case imageURL = "imageUrl"
case subtype, supertype, hp, retreatCost, convertedRetreatCost, number, artist, rarity, series
case resultSet = "set"
case setCode, text, types, attacks, weaknesses
case imageURLHiRes = "imageUrlHiRes"
case nationalPokedexNumber
}
}
// MARK: - Attack
struct Attack: Codable {
let name: String?
let cost: [String]?
let convertedEnergyCost: Int?
let damage, text: String?
}
// MARK: - Weakness
struct Weakness: Codable {
let type, value: String?
}
typealias Result = [ResultElement]