Questions tagged [diffabledatasource]
92 questions
6
votes
0 answers
iOS table view diffable data source and prefetch
What is the correct way of using NSDiffableDataSourceSnapshot and - (void)tableView:(nonnull UITableView *)tableView prefetchRowsAtIndexPaths:(nonnull NSArray *)indexPaths.
It seems that every time prefetch reloads table view, table…
Martin Berger
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6
votes
6 answers
Swift: Please specify a valid section definition when content is to be rendered for a section. This is a client error
I'm currently working on a simple IOS app using a collection view and diffable datasource.
I initalize the everything in the view controller's config and call a reloadView-function every time I update the source data.
The app crashes with the…
Schurigeln
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6
votes
0 answers
iOS UICollectionViewDiffableDataSource reloads all data with no changes
I have a simple UICollectionView with 1 section and 1 item type powered by new iOS 13 UICollectionViewDiffableDataSource.
Even with no changes to data source (identical hashValues), UICollectionViewDiffableDataSource updates whole collection view…
Max Adamyan
- 177
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- 12
6
votes
3 answers
self captured by a closure before all members were initialized - but I did initialize them
This is a toy example but it reduces exactly the situation I'm in:
class MyDataSource: UITableViewDiffableDataSource {
var string : String?
init(string:String?) {
self.string = string
super.init(tableView:…
matt
- 515,959
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- 875
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5
votes
5 answers
TableView scrolling to top after applying UITableViewDiffableDataSource snapshot
I'm doing pagination using UITableViewDataSourcePrefetching.
The values will be taken from the Realm local storage.
I will get an array of objects. These values will be applied to the existing UITableViewDiffableDataSource datasource.
After applying…
Yasheed Mohammed
- 187
- 1
- 14
5
votes
3 answers
How to update footer in Section via DiffableDataSource without causing flickering effect?
A Section may contain 1 header, many content items and 1 footer.
For DiffableDataSource, most of the online examples, are using enum to represent Section. For instance
func applySnapshot(_ animatingDifferences: Bool) {
var snapshot = Snapshot()
…
Cheok Yan Cheng
- 47,586
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5
votes
2 answers
How can a diffable collection view display the same item in multiple sections?
My app presents an emoji keyboard like Apple's where the emoji are displayed by-category. I render this using a collection view where the categories are sections. If an emoji has been inserted recently, it should appear in the "Frequently Used"…
Jeffrey Wear
- 1,155
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5
votes
1 answer
Collection View Diffable Data Source cells disappearing and not resizing properly?
I'm having a really weird issue with my collection view. I'm using the Compositional Layout and Diffable Data Source APIs for iOS 13+, but I'm getting some really weird behavior. As seen in the video below, when I update the data source, the first…
bryan-vh
- 151
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- 9
5
votes
1 answer
Applying NSDiffableDataSourceSnapshot to UICollectionViewDiffableDataSource causes 'NSInternalInconsistencyException'
I am trying to implement a UICollectionViewDiffableDataSource for my collectionView. My code compiles fine, however I keep running into this error the first time I apply a snapshot to it, with the following error:
Terminating app due to uncaught…
Brinkster
- 182
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5
votes
1 answer
Creating a section title with UITableViewDiffableDataSource
I'm tinkering a bit with UITableViewDiffableDataSource and I'm able to get a tableView to load without issue. I'm trying to create section headers in the tableView, however I've encountered some flakey behavior.
The section enum enum defined as…
Adrian
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4
votes
1 answer
Diffable datasource performance issues with > 20K rows
I run into performance issues with the diffable data source when having a larger data set, around 22,000 items. I am surprised that applying the snapshot takes so much time when animation is ON. See the code section:
let shouldAnimate =…
Zsolt
- 3,648
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- 47
4
votes
0 answers
Animation Glitch When Deleting UICollectionViewDiffableDataSource Item From Context Menu
I have adopted the new UICollectionViewDiffableDataSource. I am applying a datasource snapshot everytime I delete an item:
var snapshot = NSDiffableDataSourceSnapshot
Stephen
- 1,427
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3
votes
1 answer
DiffableDataSource re-create all section after update array
I created a struct for UICollectionViewDiffableDataSource
struct Section: Hashable {
let name: String
let items: [Int]
}
And created snapshot with this structure
func updateData(for data: [Section]) {
var snapshot =…
Mixorok
- 125
- 9
3
votes
0 answers
collectionView inside the tableView using diffable data source
I've an issue when using the collectionView inside the tableViewCell XiB using diffable data source.Two sections I want to display like mens and womens.I don't know how to iterate the each case and display the record accordingly please check the…
Faheem
- 97
- 5
3
votes
1 answer
How to handle empty state when using diffable data source - UICollectionViewDiffableDataSource?
When using traditional UICollectionView, we often use the following code to handle empty state:
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if items.count == 0 {
// Display empty…
imgroot
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