Swift 3 Playground URLSession异步中的UIImage Gray

Question

Bach显示在put()文件中，但显示为灰色。切换不同的.playground没有帮助。

Result Display Modes

使用Swift 3.0在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() 中呈现Bach或任何UIImageView的最佳方法是什么？

Answer 1

我找出了你所看到的问题，并在这里创建了一个游乐场来说明：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")

基本上，当游乐场仍在运行时，图像会显得褪色。由于您needsInfiniteExecution设置为true，因此它总是显得褪色。