SIGABRT error in Swift when JSON deserializing - json

Question

I am attempting to make a Swift application with two main focuses. One is to display all the data from an URL in a ScrollView and the other is a button to get a random name of a game.
The button works and I get a random game but when I try to load the application with the UIScrollView, I get a SIGABRT on line 33.
Any help is appreciated
EDIT: I have since fixed the SIGABRT but I can't seem to display any information into the UIScrollView. Anyone see any glaring issues in the code now?
#IBOutlet weak var infoView: UIView!
#IBOutlet weak var label: UILabel!
#IBOutlet weak var labelScroll: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
parseGame()
}
func parseGame() {
let url: URL = URL(string: "https://www.giantbomb.com/api/games/?api_key=5094689370c2cf4ae42a2a268af0595badb1fea8&format=json&field_list=name")!
print(url)
let responseData: Data? = try? Data(contentsOf: url)
if let responseData = responseData {
let json: Any? = try? JSONSerialization.jsonObject(with: responseData, options: [])
print(json ?? "Couldn't get JSON")
if let json = json {
let dictionary: [String: Any]? = json as? [String: Any]
if let dictionary = dictionary {
guard let result = dictionary["results"] as? [String:Any]? else { return }
if let result = result {
let name = result["name"] as? String?
if let name = name {
for i in 1...100 {
labelScroll.text = "Name: \(name)"
}
}
}
}
}
}
}

Answer 1

Oh no! It's the json parsing pyramid of death!
A Neat Little Alternative
If you know the structure of the json you will be receiving, you can create some structs to model your data. Also Swift has a cool protocol called "Codable" which does a lot of heavy lifting in parsing json and converting it to an object you create in code.
Let's Model the Data!
We'll create 2 structs that conform to the Codable Protocol. The first will hold the entire response data
struct ApiGameReponse:Codable {
var error:String
var limit:Int
var offset:Int
var pages:Int
var totalResults:Int
var status:Int
var version:String
var games:[Game]
private enum CodingKeys:String, CodingKey {
//The enum's rawValue needs to match the json's fieldName exactly.
//That's why some of these have a different string assigned to them.
case error
case limit
case offset
case pages = "number_of_page_results"
case totalResults = "number_of_total_results"
case status = "status_code"
case version
case games = "results"
}
}
and the second struct to model our game object. (Which is a single string, yes I know very exciting...) Since this particular json data represents a game with only 1 name property we don't really need a whole struct, but if the json was different and say had a "gamePrice" and "genre" properties, a struct would be nicer to look at.
struct Game:Codable {
var name:String
}
Keepin it pretty
Idk about you, but I don't like to look at ugly code. To keep it clean, we're going to split the function you made into two pieces. It's always better to have a bunch of smaller readable/reusable functions that each complete a single task rather than 1 superSizeMe number 3 with a large coke.
Getting the Data
Piece 1: Get the data from the URL
func getJSONData(_ urlString: String) -> Data? {
guard
let url:URL = URL(string: urlString),
let jsonData:Data = try? Data(contentsOf: url)
else { return nil }
return jsonData
}
Piece 2: Decode the data into something we can use
func getGameNames() -> [String] {
let apiEndpoint = "https://www.giantbomb.com/api/games/?api_key=5094689370c2cf4ae42a2a268af0595badb1fea8&format=json&field_list=name"
guard
let data = getJSONData(apiEndpoint),
let response = try? JSONDecoder().decode(ApiGameReponse.self, from: data)
else { return [] }
//Neat little function "map" allows us to create an array names from the array of game objects.
let nameArray = response.games.map { $0.name }
return nameArray
}
Implementation
And finally we can get the names and use them as needed.
override func viewDidLoad() {
//I recommend putting this somewhere else
//Perhaps create a method called "setup()" and call it in this class's inializer.
let names = getGameNames()
print(names) //Implement the array of names as needed
}