zhxnlai

<style id="jsbin-css">
@import url(https://fonts.googleapis.com/css?family=Roboto);

body {
  font-family: Roboto, sans-serif  !important;
  max-width: 650px;
  margin: auto;
  padding: 1em;
}

zhxnlai

<style id="jsbin-css">
@import url(https://fonts.googleapis.com/css?family=Roboto);

body {
  font-family: Roboto, sans-serif  !important;
  max-width: 650px;
  margin: auto;
  padding: 1em;
}

zhxnlai

<style id="jsbin-css">
@import url(https://fonts.googleapis.com/css?family=Roboto);

body {
  font-family: Roboto, sans-serif  !important;
  max-width: 650px;
  margin: auto;
  padding: 1em;
}

zhxnlai

<style id="jsbin-css">
@import url(https://fonts.googleapis.com/css?family=Roboto);

body {
  font-family: Roboto, sans-serif  !important;
  max-width: 650px;
  margin: auto;
  padding: 1em;
}

zhxnlai

extension NSURL : ThrowableTaskType {

    public typealias ReturnType = (NSData, NSURLResponse)
    
    public func action(completion: Result<ReturnType> -> ()) {
        ThrowableTask<ReturnType> {
            let session = NSURLSession(configuration: .ephemeralSessionConfiguration())
            let (data, response, error) = Task { callback in session.dataTaskWithURL(self, completionHandler: callback).resume()}.await()
            guard error == nil else { throw error! }
            return (data!, response!)

zhxnlai

class ImagePickerDemoViewController: UIViewController {

    let imageView = UIImageView()

    func launchImagePicker() {
        Task {
            do {
                let data = try ImagePickerTask(viewController: self).await()
            } catch Error.PhotoLibraryNotAvailable {
                alert("Photo Library is Not Available")

zhxnlai

class ImagePickerTask : NSObject {

    enum Error : ErrorType {
        case PhotoLibraryNotAvailable
    }

    typealias CompletionHandler = [String: AnyObject]? -> ()
    var completionHandler: CompletionHandler!
    let viewController: UIViewController

zhxnlai

func load(path: String) -> ThrowableTask<NSData> {
    return ThrowableTask {
        switch path {
        case "profile.png":
            return NSData()
        case "index.html":
            return NSData()
        default:
            throw Error.NotFound
        }

zhxnlai

let replicatedURLs = ["https://web1.swift.org", "https://web2.swift.org"]
let first = replicatedURLs.map(get).awaitFirst()

let messages = ["1", "2", "3"]
let all = messages.map(encrypt).awaitAll()

zhxnlai

Task {
    print(“downloading image”)
    var image = UIImage(data: downloadImage.await())!
    updateImageView(image).await(.Main)
    print(“processing image”)
    image = processImage(image).await()
    updateImageView(image).await(.Main)
    print(“finished”)
}.async()