PHFetchOptions()照片仅使用PHAsset & PHAssetCollection

Question

我在这里使用Apple示例代码中的一个块：

override func awakeFromNib() {
    // Create a PHFetchResult object for each section in the table view.
    let allPhotosOptions = PHFetchOptions()
    allPhotosOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]

    let allPhotos = PHAsset.fetchAssetsWithOptions(allPhotosOptions)
    let smartAlbums = PHAssetCollection.fetchAssetCollectionsWithType(.SmartAlbum, subtype: .AlbumRegular, options: nil)

    let topLevelUserCollections = PHCollectionList.fetchTopLevelUserCollectionsWithOptions(nil)

    // Store the PHFetchResult objects and localized titles for each section.
    self.sectionFetchResults = [allPhotos, smartAlbums, topLevelUserCollections]
    self.sectionLocalizedTitles = ["", NSLocalizedString("Smart Albums", comment: ""), NSLocalizedString("Albums", comment: "")]

    PHPhotoLibrary.sharedPhotoLibrary().registerChangeObserver(self)
}

此列表成功地列出了所有专辑。

我需要的是：

我想只列出相册与照片，不包括视频。此外，不允许视频在专辑中列出，比如在“所有照片”中。

我试过的是：

let fetchOptions = PHFetchOptions()
fetchOptions.predicate = NSPredicate(format: "mediaType = %d", PHAssetMediaType.Image.rawValue)

这导致说“获取选项中不支持的谓词: mediaType == 1”的崩溃。

Answer 1

我知道这是一个很晚的答案，但是如果像我这样的人到了这里，你应该使用这个方法来检索一个媒体类型。在本例中，PHAssetMediaType.image

func fetchAssets(with mediaType: PHAssetMediaType, options: PHFetchOptions?) -> PHFetchResult<PHAsset>

所以在Swift 5中，它写成

let allPhotosOptions = PHFetchOptions()
allPhotosOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
fetchResult = PHAsset.fetchAssets(with: .image, options: allPhotosOptions)

Answer 2

到目前为止，它对我来说还不错：

let allAlbums = PHAssetCollection.fetchAssetCollections(with: .album, subtype: .albumRegular, options: nil)
let someAlbum = allAlbums.object(at: 0)
let onlyPhotoOption = PHFetchOptions()
onlyPhotoOption.predicate = NSPredicate(format: "mediaType == %i", PHAssetMediaType.image.rawValue)
let photos = PHAsset.fetchAssets(in: someAlbum, options: onlyPhotoOption)