How do I fetch only certain PHCollections?

Question

I've created three PHCollections within my app. In a different part of my app, I'm attempting to fetch them and display them in a table view. I can get all of the user created libraries by using the following code

    let topLevelUserCollections: PHFetchResult  = PHCollectionList.fetchTopLevelUserCollectionsWithOptions(nil)
    self.collectionsFetchResults = [topLevelUserCollections];
    self.collectionsLocalizedTitles = ["My Clips"];
    PHPhotoLibrary.sharedPhotoLibrary().registerChangeObserver(self) //With this you need to conform to PHPhotoLibraryChangeObserver

but how can I fetch only the asset collection I want? Also, I only want video and not images, is there a way to fetch only results with videos assests?

Answer 1

You are calling PHCollectionList.fetchTopLevelUserCollectionsWithOptions with a parameter of nil. But that nil is the PHFetchOptions. Those PHFetchOptions are exactly how you make this sort of specification.

In particular, if you created these collections yourself, you have their localIdentifier values. That is exactly what you would specify in the PHFetchOptions predicate to pull out those collections. You could also do it by localizedTitle and so on.