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Questions tagged [uicollectionviewdiffabledatasource]

75 questions
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How to stop UICollectionViewDiffableDataSource to scroll the collection view while apply snapshot?

I have a UICollectionViewDiffableDataSource for vertical scrolling, with dynamic height cells. Every time I call 'apply' on the datasource the collection view scrolls a bit and it doesn't look good. How do I prevent it from scrolling? private func…
Gili Ariel
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UICollectionViewCompositionalLayout can't use the same sections as UICollectionViewDiffableDataSource?

I'm building a view controller with a collection view, using the (kinda) new diffable datasource and composable collectionview layout. I made my own Section and Row enums, can react to changes in my model (an array of photos), which triggers the…
Kevin Renskers
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Diffable Data Source - Reload Header

What are the ways in which a UICollectionViewDiffableDataSource header can be reloaded? I have a collection view with a header that displays user details, and rows that display posts, the model is struct PostUser { var user: User var post:…
mickeysox
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UICollectionViewDiffableDataSource is replacing data instead of updating

I am trying to understand UICollectionViewDiffableDataSource and NSDiffableDataSourceSnapshot. I have created a very crude version below. Essentially on load it should fetch photos. On tap of a button in the navigation bar it fetches the next page.…
Harry Blue
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Custom insert / delete animations in a modern UICollectionView

How to apply custom insert / delete animation for collection view cells when using UICollectionViewCompositionalLayout with UICollectionViewDiffableDataSource? Previously I did it by subclassing UICollectionViewLayout and overriding…
tadija
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SwiftUI runtime crash ONLY IN IOS15 when using compositional layout with a uiviewrepresentable of collectionview

Getting a runtime crash when removing uiviewrepresentable of a collection view using compositional layout and a diffable data source from the screen. The view is currently in an if statement, if no data is found it uses a empty data view instead of…
Spencer Shelton
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UICollectionView Diffable Data Source - How to retain move animation between sections, yet able to update the content of header?

I have 2 sections. The top section contains unchecked items. The bottom section contains checked items. I was able to achieve nice move animation between the 2 sections, when I check/ uncheck the item. The implementation is pretty straightforward…
Cheok Yan Cheng
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Why DispatchQueue.main.async is required when using CoreData, NSFetchedResultsController and Diffable Data Source

When dealing with CoreData, NSFetchedResultsController and Diffable Data Source, I always notice that I need to apply DispatchQueue.main.async. For instance, Before applying DispatchQueue.main.async extension ViewController:…
Cheok Yan Cheng
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performFetch creating diffable data source snapshots with too much data

After executing an NSBatchBatchInsertRequest and calling fetchedResultsController.performFetch(), the frc’s delegate method controller(_:didChangeContentWith:) is called with a NSDiffableDataSourceSnapshot that…
Alex Walczak
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UICollectionViewDiffableDataSource custom subclass initialization

So I am making a custom subclass of UICollectionViewDiffableDataSource. My code looks like this : class MyDiffableDataSource: UICollectionViewDiffableDataSource { convenience required init(collectionView: UICollectionView)…
user15102768
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1 answer

How to stop UICollectionViewDiffableDataSource to scroll the collection view while we apply snapshot?

Is there any way that I can make UICollectionViewDiffableDataSource stop scrolling collection view while we apply snapshot? I am using this library: https://github.com/ra1028/DiffableDataSources I have a situation where I want to keep the collection…
Gaurav Parvadiya
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diffable data source section header blinks during update

I'm currently facing the issue, that when applying a new snapshot to my current data source, that the header, footer and decoration views are not part of the collection view's subviews, which can be noticed as a weird flicker. Did anyone face that…
Carsten
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Diffable Data Source with a custom collection view layout?

Here I have created a sample app that uses diffable data source for a collection view with a custom collection view layout. The specific layout I am using is from this tutorial. Here is the relevant part of the code if you don't want to clone the…
BigBoy1337
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Crash number of items in section 0 when there are only 0 sections in the collection view

I want to learn using UICollectionViewDiffableDataSource using Pinterest Layout, but when I try to running my simulator. it crash and give me a message request for number of items in section 0 when there are only 0 sections in the collection…
ferryawijayanto
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Diffable Data Source With Multiple Sections And Objects

I have a Data Source with multiple sections and objects. When creating my Data Source I can only access the section or the item type. I need to access both, is there a cleaner way to do this? My model is below; enum BrowseSectionType: Hashable { …
David Henry
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