How to properly execute tasks in a background thread in Swift (Grand Central Dispatch)

Hello everyone! I'm new to Swift and iOS development. I'm writing a simple app for downloading images from the internet. When I click the "Download" button, the interface freezes for a few seconds until the image appears. I've heard that I need to use background threads to avoid blocking the main thread (UI). But I don't understand how to do this correctly in Swift. Here's my current code: ```swift import UIKit class ViewController: UIViewController { @IBOutlet weak var imageView: UIImageView! @IBAction func loadImageTapped(_ sender: UIButton) { // Problem: this code runs on the main thread let url = URL(string: "https://example.com/large-image.jpg")! let data = try! Data(contentsOf: url) imageView.image = UIImage(data: data) } } ```