从URL设置UIImageView中的缩略图

import UIKit
import Alamofire

class ViewController: UIViewController {
    
    @IBOutlet weak var imageView: UIImageView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let url = URL(string: "https://example.com/image.jpg") // 替换为实际的图片URL
        
        // 使用Alamofire发送网络请求
        AF.request(url!).responseData { response in
            switch response.result {
            case .success(let data):
                if let image = UIImage(data: data) {
                    // 创建缩略图
                    let thumbnailSize = CGSize(width: 100, height: 100) // 缩略图大小
                    UIGraphicsBeginImageContextWithOptions(thumbnailSize, false, 0.0)
                    image.draw(in: CGRect(origin: .zero, size: thumbnailSize))
                    let thumbnailImage = UIGraphicsGetImageFromCurrentImageContext()
                    UIGraphicsEndImageContext()
                    
                    // 设置缩略图到UIImageView
                    DispatchQueue.main.async {
                        self.imageView.image = thumbnailImage
                    }
                }
            case .failure(let error):
                print("Error: \(error)")
            }
        }
    }
}