如何将图片保存到外部目录- iOS？

import UIKit
import Photos

func saveImageToExternalDirectory(image: UIImage) {
    guard let imageData = image.jpegData(compressionQuality: 1.0) else {
        print("Failed to convert image to data")
        return
    }
    
    let fileManager = FileManager.default
    let documentsDirectory = fileManager.urls(for: .documentDirectory, in: .userDomainMask).first!
    let imageDirectory = documentsDirectory.appendingPathComponent("Images")
    
    do {
        try fileManager.createDirectory(at: imageDirectory, withIntermediateDirectories: true, attributes: nil)
        
        let uniqueFileName = "\(UUID().uuidString).jpg"
        let fileURL = imageDirectory.appendingPathComponent(uniqueFileName)
        
        try imageData.write(to: fileURL)
        
        // Add the image to the photo library
        PHPhotoLibrary.shared().performChanges({
            PHAssetChangeRequest.creationRequestForAssetFromImage(atFileURL: fileURL)
        }) { (success, error) in
            if success {
                print("Image saved to external directory and photo library")
            } else {
                print("Failed to save image to photo library: \(error?.localizedDescription ?? "")")
            }
        }
    } catch {
        print("Failed to create directory or write image file: \(error.localizedDescription)")
    }
}