在自定义相册中创建文件夹

我有一个自定义相册，我的应用程序从相机中保存图片。 我想知道是否有一种方法可以在我的相册中创建文件夹，以便我可以在其中堆叠某些图像？

回答

正如其他成员所提到的，遗憾的是你无法在专辑中创建一个文件夹。

Answer 1

你应该尝试下面的代码。 这是Swift 3.0语法。 🙂

import Foundation import Photos class CustomPhotoAlbum: NSObject { static let albumName = "Album Name" static let sharedInstance = CustomPhotoAlbum() var assetCollection: PHAssetCollection! override init() { super.init() if let assetCollection = fetchAssetCollectionForAlbum() { self.assetCollection = assetCollection return } if PHPhotoLibrary.authorizationStatus() != PHAuthorizationStatus.authorized { PHPhotoLibrary.requestAuthorization({ (status: PHAuthorizationStatus) -> Void in () }) } if PHPhotoLibrary.authorizationStatus() == PHAuthorizationStatus.authorized { self.createAlbum() } else { PHPhotoLibrary.requestAuthorization(requestAuthorizationHandler) } } func requestAuthorizationHandler(status: PHAuthorizationStatus) { if PHPhotoLibrary.authorizationStatus() == PHAuthorizationStatus.authorized { // ideally this ensures the creation of the photo album even if authorization wasn't prompted till after init was done print("trying again to create the album") self.createAlbum() } else { print("should really prompt the user to let them know it's failed") } } func createAlbum() { PHPhotoLibrary.shared().performChanges({ PHAssetCollectionChangeRequest.creationRequestForAssetCollection(withTitle: CustomPhotoAlbum.albumName) // create an asset collection with the album name }) { success, error in if success { self.assetCollection = self.fetchAssetCollectionForAlbum() } else { print("error \(error)") } } } func fetchAssetCollectionForAlbum() -> PHAssetCollection? { let fetchOptions = PHFetchOptions() fetchOptions.predicate = NSPredicate(format: "title = %@", CustomPhotoAlbum.albumName) let collection = PHAssetCollection.fetchAssetCollections(with: .album, subtype: .any, options: fetchOptions) if let _: AnyObject = collection.firstObject { return collection.firstObject } return nil } func save(image: UIImage) { if assetCollection == nil { return // if there was an error upstream, skip the save } PHPhotoLibrary.shared().performChanges({ let assetChangeRequest = PHAssetChangeRequest.creationRequestForAsset(from: image) let assetPlaceHolder = assetChangeRequest.placeholderForCreatedAsset let albumChangeRequest = PHAssetCollectionChangeRequest(for: self.assetCollection) let enumeration: NSArray = [assetPlaceHolder!] albumChangeRequest!.addAssets(enumeration) }, completionHandler: nil) } }