使用PhotoKit在文件夹内创建子文件夹

import Photos

func createSubfolderInFolder(folderTitle: String, subfolderTitle: String) {
    let fetchOptions = PHFetchOptions()
    fetchOptions.predicate = NSPredicate(format: "title = %@", folderTitle)
    let folder = PHAssetCollection.fetchAssetCollections(with: .album, subtype: .any, options: fetchOptions).firstObject
    
    if let folder = folder as? PHAssetCollection {
        PHPhotoLibrary.shared().performChanges({
            let creationRequest = PHAssetCollectionChangeRequest.creationRequestForAssetCollection(withTitle: subfolderTitle)
            let folderChangeRequest = PHAssetCollectionChangeRequest(for: folder)
            folderChangeRequest?.addChildCollections([creationRequest.placeholderForCreatedAssetCollection] as NSFastEnumeration)
        }, completionHandler: { success, error in
            if success {
                print("Subfolder created successfully.")
            } else {
                print("Error creating subfolder: \(error?.localizedDescription ?? "")")
            }
        })
    } else {
        print("Folder not found.")
    }
}

// 调用示例
createSubfolderInFolder(folderTitle: "My Photos", subfolderTitle: "Vacation")