如何在swift中按升序保存图片？

import UIKit

func saveImage(image: UIImage) {
    // 创建保存图片的文件夹
    let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
    let imagesDirectory = documentsDirectory.appendingPathComponent("Images")
    
    do {
        try FileManager.default.createDirectory(at: imagesDirectory, withIntermediateDirectories: true, attributes: nil)
    } catch {
        print("创建文件夹失败: \(error.localizedDescription)")
        return
    }
    
    // 创建文件名，格式为日期和时间
    let formatter = DateFormatter()
    formatter.dateFormat = "yyyyMMddHHmmss"
    let filename = formatter.string(from: Date())
    
    // 将图片转换为数据
    guard let imageData = UIImageJPEGRepresentation(image, 1) else {
        print("图片转换失败")
        return
    }
    
    // 写入文件
    let imagePath = imagesDirectory.appendingPathComponent("\(filename).jpg")
    FileManager.default.createFile(atPath: imagePath.path, contents: imageData, attributes: nil)
    
    print("图片保存成功，路径为: \(imagePath)")
}

// 使用示例
let image = UIImage(named: "example.jpg")
saveImage(image: image)