I can print data but can't assign it to a label in Swift - swift

Question

I sent my data from my API call to my InfoController viewDidLoad. There, I was able to safely store it in a skillName constant, and also printed it, receiving all the information by console.
The problem comes when I try to assign this variable to my skillLabel.
override func viewDidLoad() {
super.viewDidLoad()
configureViewComponents()
fetchPokemons { (names) in
guard var skillName = names as? String else { return }
self.pokemon?.skillName = skillName
self.allNames = skillName
print(self.allNames)
}
}
There, when I print allNames, the console shows all the data I need. This is how the data looks like: Data Example
And the computed property where I wanna use this data looks is:
var pokemon: Pokemon? {
didSet {
guard let id = pokemon?.id else { return }
guard let data = pokemon?.image else { return }
navigationItem.title = pokemon?.name?.capitalized
infoLabel.text = pokemon?.description
infoView.pokemon = pokemon
if id == pokemon?.id {
imageView.image = UIImage(data: data)
infoView.configureLabel(label: infoView.skillLabel, title: "Skills", details: "\(allNames)")
}
}
}
PD: allNames is a String variable I have at InfoController class-level.
This is how my app looks when run:
PokeApp
My goal is to get that details param to show the skillName data, but it returns nil, idk why. Any advice?
EDIT1: My func that fetches the Pokemon data from my service class is this one:
func fetchPokemons(handler: #escaping (String) -> Void) {
controller.service.fetchPokes { (poke) in
DispatchQueue.main.async {
self.pokemon? = poke
guard let skills = poke.abilities else { return }
for skill in skills {
guard let ability = skill.ability else { return }
guard var names = ability.name!.capitalized as? String else { return }
self.pokemon?.skillName = names
handler(names)
}
}
}
}
EDIT2: InfoView class looks like:
class InfoView: UIView {
// MARK: - Properties
var delegate: InfoViewDelegate?
// This whole block assigns the attributes that will be shown at the InfoView pop-up
// It makes the positioning of every element possible
var pokemon: Pokemon? {
didSet {
guard let pokemon = self.pokemon else { return }
guard let type = pokemon.type else { return }
guard let defense = pokemon.defense else { return }
guard let attack = pokemon.attack else { return }
guard let id = pokemon.id else { return }
guard let height = pokemon.height else { return }
guard let weight = pokemon.weight else { return }
guard let data = pokemon.image else { return }
if id == pokemon.id {
imageView.image = UIImage(data: data)
}
nameLabel.text = pokemon.name?.capitalized
configureLabel(label: typeLabel, title: "Type", details: type)
configureLabel(label: pokedexIdLabel, title: "Pokedex Id", details: "\(id)")
configureLabel(label: heightLabel, title: "Height", details: "\(height)")
configureLabel(label: defenseLabel, title: "Defense", details: "\(defense)")
configureLabel(label: weightLabel, title: "Weight", details: "\(weight)")
configureLabel(label: attackLabel, title: "Base Attack", details: "\(attack)")
}
}
let skillLabel: UILabel = {
let label = UILabel()
return label
}()
let imageView: UIImageView = {
let iv = UIImageView()
iv.contentMode = .scaleAspectFill
return iv
}()
. . .
}
infoView.configureLabel is this:
func configureLabel(label: UILabel, title: String, details: String) {
let attributedText = NSMutableAttributedString(attributedString: NSAttributedString(string: "\(title): ", attributes: [NSAttributedString.Key.font : UIFont.boldSystemFont(ofSize: 16), NSAttributedString.Key.foregroundColor: Colors.softRed!]))
attributedText.append(NSAttributedString(string: "\(details)", attributes: [NSAttributedString.Key.font : UIFont.systemFont(ofSize: 16), NSAttributedString.Key.foregroundColor: UIColor.gray]))
label.attributedText = attributedText
}
EDIT 3: Structures design
struct Pokemon: Codable {
var results: [Species]?
var abilities: [Ability]?
var id, attack, defense: Int?
var name, type: String?
...
}
struct Ability: Codable {
let ability: Species?
}
struct Species: Codable {
let name: String?
let url: String?
}

Answer 1

Jump to the Edit2 paragraph for the final answer!
Initial Answer:
I looks like you UI does not get updated after the controller fetches all the data.
Since all of you UI configuration code is inside the var pokemon / didSet, it's a good idea to extract it to a separate method.
private func updateView(with pokemon: Pokemon?, details: String?) {
guard let id = pokemon?.id, let data = pokemon?.image else { return }
navigationItem.title = pokemon?.name?.capitalized
infoLabel.text = pokemon?.description
infoView.pokemon = pokemon
if id == pokemon?.id {
imageView.image = UIImage(data: data)
infoView.configureLabel(label: infoView.skillLabel, title: "Skills", details: details ?? "")
}
}
and now you can easily call in the the didSet
var pokemon: Pokemon? {
didSet { updateView(with: pokemon, details: allNames) }
}
and fetchPokemons completion aswell
override func viewDidLoad() {
super.viewDidLoad()
configureViewComponents()
fetchPokemons { (names) in
guard var skillName = names as? String else { return }
self.pokemon?.skillName = skillName
self.allNames = skillName
print(self.allNames)
DispatchQueue.main.async {
self.updateView(with: self.pokemon, details: self.allNames)
}
}
}
It's super important to do any UI setup on the main queue.
Edit:
The fetch function may be causing the problems! you are calling handler multiple times:
func fetchPokemons(handler: #escaping (String) -> Void) {
controller.service.fetchPokes { (poke) in
DispatchQueue.main.async {
self.pokemon? = poke
guard let skills = poke.abilities else { return }
let names = skills.compactMap { $0.ability?.name?.capitalized }.joined(separator: ", ")
handler(names)
}
}
}
Edit2:
After looking at your codebase there are a couple of things you need to change:
1. fetchPokemons implementation
the handler of controller.service.fetchPokes gets called for every pokemon so we need to check if the fetched one is the current (self.pokemon) and then call the handler with properly formated skills.
func fetchPokemons(handler: #escaping (String) -> Void) {
controller.service.fetchPokes { (poke) in
guard poke.id == self.pokemon?.id else { return }
self.pokemon? = poke
let names = poke.abilities?.compactMap { $0.ability?.name?.capitalized }.joined(separator: ", ")
handler(names ?? "-")
}
}
2. update viewDidLoad()
now simply pass the names value to the label.
override func viewDidLoad() {
super.viewDidLoad()
configureViewComponents()
fetchPokemons { (names) in
self.pokemon?.skillName = names
self.infoView.configureLabel(label: self.infoView.skillLabel, title: "Skills", details: names)
}
}
3. Refactor var pokemon: Pokemon? didSet observer
var pokemon: Pokemon? {
didSet {
guard let pokemon = pokemon, let data = pokemon.image else { return }
navigationItem.title = pokemon.name?.capitalized
infoLabel.text = pokemon.description!
infoView.pokemon = pokemon
imageView.image = UIImage(data: data)
}
}