如何使用PHAsset获取[PHAssetCollection]

Question

我可以得到所有的照片，但我不知道如何找到这些照片所在的相册。另一种选择是浏览所有相册并从中获取照片。我认为这不是一个好的选择。目标是获取每张照片的相册名称。

    private func getPhotosAll() -> [String:Photo] {
        var photos = [String:Photo]()
        let assets = PHAsset.fetchAssets(with: .image, options: nil)
        assets.enumerateObjects({ (asset, index, stop) in
            let id = asset.localIdentifier
            guard (id.isEmpty == false) else {
                return
            }
            guard let name = asset.originalFilename else {
                return
            }
            let photo = Photo()
            photo.name = name
            // TODO: Read albums?
            photo.albums = [String]()
            photos[id] = photo
        })
        return photos
    }

更新。我只得到用户相册。如何获得剩下的呢？(Camera Roll，人物，地点，最近删除)

var albums = Set<String>()
let typesAlbum: [PHAssetCollectionType] = [.album, .smartAlbum, .moment]
for type in typesAlbum {
    let collectionsBox = PHAssetCollection.fetchAssetCollectionsContaining(asset,
            with: type, options: nil)
    collectionsBox.enumerateObjects { (collection, _, _) in
        guard let albumName = collection.localizedTitle else {
            return
        }
        albums.insert(albumName)
    }
}

Answer 1

对于每个PHAsset，调用fetchAssetCollectionsContaining(_:with:options:)。