PHFetchOptions() 照片僅使用 PHAsset 和 PHAssetCollection

Question

我在這里使用了 Apple 示例代碼中的一段：

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)
}

這將成功列出所有專輯。

我需要什么：

我只想列出帶有照片的相冊，排除視頻。 此外，將視頻排除在相冊中，例如在“所有照片”中。

我試過的：

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

這會導致崩潰，說“獲取選項中不支持的謂詞：mediaType == 1”

Answer 1

我知道這是一個很晚的答案，但是如果像我這樣的人來到這里，您應該使用此方法來檢索媒體類型。 在這種情況下PHAssetMediaType.image

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

所以在 Swift 5 中它寫為

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

Answer 2

到目前為止，它對我來說很好用：

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)