A UIImage Gray in Swift 3 Playground URLSession Async

Question

Bach displays in a .playground file but is gray. Toggling different Result Display Modes did not help.

import UIKit import PlaygroundSupport PlaygroundPage.current.needsIndefiniteExecution = true URLCache.shared = URLCache(memoryCapacity: 0, diskCapacity: 0, diskPath: nil) var theImage = UIImageView() let urlNew = NSURL(string: "https://upload.wikimedia.org/wikipedia/commons/6/6a/Johann_Sebastian_Bach.jpg") let task = URLSession.shared.dataTask(with: urlNew! as URL) { (data, response, error) -> Void in if error != nil { print("thers an error in the log") } else { DispatchQueue.main.async() { let image = UIImage(data: data!) theImage.image = image } } } task.resume()

What is the best way to render Bach or any UIImageView in a .playground with Swift 3.0?

What have you tried so far? It's obviously downloading the proper image, it may just be a UI bug in playgrounds. You should also be able to skip the UIImageView and just display the UIImage directly. — Dave Weston
– Dave Weston, Commented Mar 8, 2017 at 3:41
I tried. Updating the code from UIImageView to UIImage has no effect on the gray shading. — Eric
– Eric, Commented Mar 8, 2017 at 3:56
I'm not in front of my computer just now, but I'll try to reproduce the issue later tonight. — Dave Weston
– Dave Weston, Commented Mar 8, 2017 at 4:16

Dave Weston · Accepted Answer · 2017-03-08 05:52:29Z

I figured out the issue you're seeing, and created a playground here to illustrate: https://github.com/dtweston/Bach.playground

import UIKit import PlaygroundSupport // Toggle the code below to fade the image out or display it properly //PlaygroundPage.current.needsIndefiniteExecution = true let image = UIImage(named: "Johann_Sebastian_Bach.jpg")

Basically, the image appears faded while the playground is still running. Since you have needsInfiniteExecution set to true, it always appears faded.

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