iOS Concurrency with GCD & Operations

Sep 12 2023 · Swift 5.8, macOS 13, iOS 16, Xcode 14.3

Part 1: Grand Central Dispatch

06. The Right Way to Download Images

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Previous episode: 05. Challenge: A Better Way to Download Images Next episode: 07. Use a Group of Tasks

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The Right Way to Download Images

There’s an even easier way to download images off the main queue.

func downloadImageWithUrlSession(index: Int) {
  URLSession.shared.dataTask(with: images[index].url) {
    [weak self] data, _, _ in

guard let self else { return }
if let data, let decodedImage = UIImage(data: data) {

DispatchQueue.main.async {
  self.images[index].image = decodedImage