Question

我在这里使用Apple的示例代码中的一块：

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)
}

这会成功列出所有相册。

我需要什么：

我想仅列出包含照片的相册，排除视频。此外，排除在相册中列出的视频，例如“所有照片”中的内容。

我尝试了什么：

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

这导致崩溃说'获取选项中的不支持的谓词：mediaType == 1'

Answer 1

我知道这是一个很晚的答案，但是如果像我这样的人来到这里，您应该使用此方法来检索媒体类型。在这种情况下， PHAssetMediaType.image

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

因此在Swift 5中它写为

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很好：

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)

PHFetchOptions（）照片仅使用PHAsset＆amp; PHAssetCollection

我需要什么：

2 个答案: