I have to get crytocurrencies logos and set them in tableView cell. JSON has the following structure
"data": {
"1": {
"id": 1,
"name": "Bitcoin",
"symbol": "BTC",
"logo": "https://s2.coinmarketcap.com/static/img/coins/64x64/1.png",
},
"2": {
"id": 2,
"name": "Litecoin",
"symbol": "LTC",
"logo": "https://s2.coinmarketcap.com/static/img/coins/64x64/2.png"
...}
This's my model:
struct Data: Decodable {
let data: [String: Id]
}
struct Id: Decodable {
let logo: String
}
According to documentation I can fetch logos for cryptocurrencies by adding ids to this URL: https://pro-api.coinmarketcap.com/v1/cryptocurrency/info?id=1,2,3,4,5... Since I need top 100 currencies, I'm getting them this way and then sending through Notification to TableViewController.
class NetworkManager {
func loadData() {
let ids = (1...100).map { String($0) }.joined(separator: ",")
guard let baseURL = URL(string: "https://pro-api.coinmarketcap.com/v1/cryptocurrency/info?id=\(ids)") else {
print("Wrong URL")
return
}
let finalURL = baseURL
var request = URLRequest(url: finalURL)
request.addValue("MyApiKey", forHTTPHeaderField: "X-CMC_PRO_API_KEY")
let dataTask = URLSession.shared.dataTask(with: request) { (data, response, error) in
if let jsonData = data {
do {
let cryptoLogo = try JSONDecoder().decode(Data.self, from: jsonData)
NotificationCenter.default.post(name: .getLogos, object: cryptoLogo)
}
catch {
print(error)
}
}
}
dataTask.resume()
}
}
To display logos I'm using ImageView extension:
extension UIImageView {
func imageFromUrl(urlString: String) {
if let url = URL(string: urlString) {
let task = URLSession.shared.dataTask(with: url) { data, response, error in
guard let data = data, error == nil else { return }
DispatchQueue.main.async() {
self.image = UIImage(data: data)
}
}
task.resume()
}
}
}
The problem is that I can print logo URLs, but can't set them properly in tableView cell. Could you please say what did I do wrong? What also worries me, it's that I get logos in not ascending order as I get in Postman. How can I sort string logos array?
@objc func getLogo(notification: Notification) {
if let responce = notification.object as? Data {
for value in responce.data.values {
data.append(value)
}
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let crypto = data[indexPath.row]
if let cell = tableView.dequeueReusableCell(withIdentifier: "imageCell", for: indexPath) as? TableViewCell {
cell.imageCell.imageFromUrl(urlString: crypto.logo)
return cell
}
return UITableViewCell()
}