在iOS上获取url的缩略图

import UIKit

func getThumbnailImage(fromURL url: URL, completion: @escaping (UIImage?) -> Void) {
    let session = URLSession.shared
    let task = session.dataTask(with: url) { (data, response, error) in
        guard let data = data, error == nil else {
            completion(nil)
            return
        }
        
        if let image = UIImage(data: data) {
            let thumbnailSize = CGSize(width: 100, height: 100) // 设置缩略图大小
            UIGraphicsBeginImageContextWithOptions(thumbnailSize, false, 0.0)
            image.draw(in: CGRect(origin: .zero, size: thumbnailSize))
            let thumbnailImage = UIGraphicsGetImageFromCurrentImageContext()
            UIGraphicsEndImageContext()
            
            completion(thumbnailImage)
        } else {
            completion(nil)
        }
    }
    task.resume()
}

// 使用示例
let url = URL(string: "https://example.com/image.jpg")!
getThumbnailImage(fromURL: url) { (thumbnailImage) in
    if let thumbnailImage = thumbnailImage {
        // 在这里使用缩略图
        print(thumbnailImage)
    } else {
        // 获取缩略图失败
        print("Failed to get thumbnail image.")
    }
}