在Swift中从UIImage生成缩略图

func generateThumbnailImage(from image: UIImage, size: CGSize) -> UIImage? {
    UIGraphicsBeginImageContextWithOptions(size, false, 0.0)
    image.draw(in: CGRect(origin: .zero, size: size))
    let thumbnailImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return thumbnailImage
}

// 使用示例
let originalImage = UIImage(named: "originalImage.jpg")
let thumbnailSize = CGSize(width: 100, height: 100)
let thumbnailImage = generateThumbnailImage(from: originalImage, size: thumbnailSize)