Episode #510

Async Networking

Series: Async / Await

6 minutes
Published on November 5, 2021

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In this episode we will see how URLSession can be used with async await. With this new API you can easily send network request and await a tuple of both the data and the response object.
func downloadThumbnail(_ url: URL) async throws -> UIImage {
    let session = URLSession.shared

    // simulate a longer delay        
    await Task.sleep(NSEC_PER_SEC)

    let (data, response) = try await session.data(from: url, delegate: nil)

    guard let http = response as? HTTPURLResponse, http.statusCode == 200 else {
        throw UnexpectedResponse()
    }

    guard let image = UIImage(data: data) else {
        throw InvalidImage()
    }

    return image
}

This episode uses Xcode 13.0, Swift 5.5.