When the user enters the detail screen, it… - Concurrency

ConcurrencyCRED

Leaving a loading screen

When the user enters the detail screen, it calls an API like this and shows the data.

final class DetailViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        api.fetchDetail(id: id) { result in
            self.render(result)
        }
    }
}

The interviewer asks: "What happens if the user taps back before the response arrives?" Explain the problems this code can cause, and how you'd keep the request for a screen the user left from going to waste.

Your answer

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