'Animating CollectionView cells like iOS Photos app Years/Months/Days picker?

I can't understand what Apple is using here in the iOS Photos collection view.

How do they transition the collection view when using the Years / Months / Days / All Photos segmented control?

Custom CollectionViewFlowLayout? Or custom transition between two CollectionViews (from "Years" to "Months" and back)?

ios uicollectionview

Solution 1:^[1]

I solved my problem with using snapshots and animate them.

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Solution	Source
Solution 1	Metman