ios - 在 imageview 中加载来自互联网的图像的函数

Question

我正在尝试创建一个函数来在运行时在 imageView 中加载图像。你能帮忙让它发挥作用吗？

这里是完整的代码:(Swift 3)

import Foundation
import UIKit

extension UIImageView {
    public func imageFromUrl(_ urlString: String) {
        if let url = URL(string: urlString) {
            let request = URLRequest(url: url)
            let session = URLSession.shared
            session.dataTask(with: request, completionHandler: {data, response, error -> Void in
                if let imageData = data as Data? {
                    self.image = UIImage(data: imageData)
                }
            })
         }
    }
 }

Answer 1

您可能错过了恢复(resume()) 数据任务。

extension UIImageView {
    public func imageFromUrl(_ urlString: String) {
        if let url = URL(string: urlString) {
            let request = URLRequest(url: url)
            let session = URLSession.shared
            session.dataTask(with: request, completionHandler: {data, response, error -> Void in
                if let imageData = data as Data? {
                    self.image = UIImage(data: imageData)
                }
            }).resume()
        }
    }
}