download an image and display it with loading state in swift

main.swift
import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var imageView: UIImageView!
    @IBOutlet weak var loadingSpinner: UIActivityIndicatorView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // Start the loading spinner
        loadingSpinner.startAnimating()
        
        // Create a URL for the image
        guard let url = URL(string: "https://example.com/image.jpg") else {
            return
        }
        
        // Create a URLSession download task
        let task = URLSession.shared.downloadTask(with: url) { (location, response, error) in
            
            // Check for errors
            guard error == nil, let location = location else {
                print("Error downloading image: \(error?.localizedDescription ?? "")")
                return
            }
            
            // Create a data object from the file
            let data = try? Data(contentsOf: location)
            
            // Update the UI on the main thread
            DispatchQueue.main.async {
                // Set the image in the image view
                if let imageData = data, let image = UIImage(data: imageData) {
                    self.imageView.image = image
                }
                
                // Stop the loading spinner
                self.loadingSpinner.stopAnimating()
            }
        }
        
        // Start the download task
        task.resume()
    }
}
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