PHFetchOptions() Photos Only Using PHAsset & PHAssetCollection

Question

I am using a chunk from Apple's sample code here:

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)
}

This lists all Albums successfully.

What I Need:

I want to only list albums with photos, exclude videos. Also, exclude video's from getting listed inside of albums, such as inside "All Photos".

What I tried:

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

This causes to crash saying 'Unsupported predicate in fetch options: mediaType == 1'

This question mentions that asset collections don't have `mediaType`s (makes sense, they can contain multiple types): http://stackoverflow.com/q/35590640 You don't show how you apply the predicate, but I guess you'll have to filter the the collections some other way. — Rhythmic Fistman, Sep 05 '16 at 03:13
@RhythmicFistman So far I believe cellForItemAtIndexPath is where I have to check and filter. — Gizmodo, Sep 05 '16 at 18:04
isn't that too late? haven't you already told the collection view about the unwanted non-images in `numberOfItemsInSection` at that point? I think you should filter before then. — Rhythmic Fistman, Sep 06 '16 at 00:05

score 4 · Answer 1 · answered Jan 21 '20 at 20:07

I know this is a very late answer, but in case someone like me gets here, you should use this method to retrieve a media type. In this case PHAssetMediaType.image

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

So in Swift 5 it writes as

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

Sorry, but this only fetches photos from all albums, not a particular one. — Eric Yuan, Aug 01 '21 at 08:10

Eric Yuan · Answer 2 · 2021-08-01T08:21:15.070

1

So far it works fine to me :

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)

edited Aug 01 '21 at 08:21

answered Aug 01 '21 at 08:08

Eric Yuan

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PHFetchOptions() Photos Only Using PHAsset & PHAssetCollection

What I Need:

2 Answers2